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Topics referred to by the same term
Look up critical angle in Wiktionary, the free dictionary. Critical angle may refer to: Critical angle (optics), the angle of incidence above which total
Critical_angle
Angle between the chord of a wing and the undisturbed airflow
critical angle. The critical angle of attack is the angle of attack which produces the maximum lift coefficient. This is also called the "stall angle
Angle_of_attack
Complete reflection of a wave
incoming ray and the normal). As the angle of incidence approaches a certain threshold, called the critical angle, the angle of refraction approaches 90°, at
Total_internal_reflection
Steepest angle at which granular materials can be piled before slumping
The angle of repose, or critical angle of repose, of a granular material is the steepest angle of descent or dip relative to the horizontal plane on which
Angle_of_repose
Formula for refraction angles
reflection. The largest possible angle of incidence which still results in a refracted ray is called the critical angle; in this case the refracted ray
Snell's_law
Abrupt reduction in lift due to flow separation
the lift coefficient generated by a foil as angle of attack exceeds its critical value. The critical angle of attack is typically about 15°, but it may
Stall_(fluid_dynamics)
Angle in geometric optics
an angle θ with the normal (dotted line). The angle of incidence at which light is first totally internally reflected is known as the critical angle. The
Angle_of_incidence_(optics)
Angle of incidence for which all reflected light will be polarized
Brewster's angle (also known as the polarization angle) is the angle of incidence at which light with a particular polarization is perfectly transmitted
Brewster's_angle
organic materials on silicon wafers, when the incident angle is in between the critical angles of the film and the substrate. In this case, the reflected
Grazing-incidence small-angle scattering
Grazing-incidence_small-angle_scattering
Property in optics
interface, as well as the critical angle for total internal reflection, their intensity (Fresnel equations) and Brewster's angle. The refractive index, n
Refractive_index
Measurement tool
instrument's inventor and based on Ernst Abbe's original design of the 'critical angle') and inline process refractometers. There is also the Rayleigh Refractometer
Refractometer
Light-conducting fiber
strike the boundary with an angle greater than the critical angle, only light that enters the fiber within a certain range of angles can travel down the fiber
Optical_fiber
Dangerous condition in aviation
aircraft in a climb. However, when the wing exceeds its critical angle of attack, an increase in angle of attack will lead to a loss of lift and a further
Coffin_corner_(aerodynamics)
Sugar content of an aqueous solution
placed on a prism; the result is observed through an eyepiece. The critical angle (the angle beyond which light is totally reflected back into the sample)
Brix
Equations of light transmission and reflection
dense medium (i.e., n1 > n2), beyond a particular incidence angle known as the critical angle, all light is reflected and Rs = Rp = 1. This phenomenon,
Fresnel_equations
In mechanics and geodynamics, a critical taper is the equilibrium angle made by the far end of a wedge-shaped agglomeration of material that is being
Critical_taper
Type of cut used when shaping a diamond
initially reflected outside the critical angle on one side of the pavilion, but meets the opposite side within the critical angle and is then refracted out
Diamond_cut
acceptance angle of the fiber. This result can be derived from Snell's law by considering the critical angle. Light that enters the core with an angle below
Guided_ray
Aviation term for a corkscrew downward path
accidents. Entry – The airplane is stalled by exceeding the wing's critical angle of attack, while allowing the aircraft to yaw, or by inducing yaw with
Spin_(aerodynamics)
"Bouncing back" of waves at an interface
reflection of light from a denser medium occurs if the angle of incidence is greater than the critical angle. Total internal reflection is used as a means of
Reflection_(physics)
Optical prism
180° to 0°, and the critical angle is where both δp and δs (red and blue) start to rise again. To the left of the critical angle is the region of partial
Fresnel_rhomb
Flat surface of a gem, crystal, etc
polished facet, the minimum angle possible for the facet to reflect the light back into the gemstone is called the critical angle. If the ray of light strikes
Facet
American wrestler (born 1968)
Kurt Steven Angle (born December 9, 1968) is an American retired professional wrestler and former amateur wrestler. He is currently a sports analyst for
Kurt_Angle
Characteristic of an optical system
optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light. By incorporating index of
Numerical_aperture
Mirror-like wave reflection
If the angle of incidence is greater than the critical angle, total internal reflection occurs: all of the light is reflected. The critical angle can be
Specular_reflection
Flight safety situation
its critical rollover angle is reached. Then, beyond this point, main rotor thrust continues the roll and recovery is impossible. If the critical rollover
Dynamic_rollover
Underwater phenomenon due to Snell's Law
Physical Optics. The Macmillan Company. p. 66. circle-of-light water critical-angle 180. Explanation of the physics behind Snell's window Under-water photograph
Snell's_window
Five-sided reflecting prism
reflection, since the beams are incident at an angle less than the critical angle (the minimum angle for total internal reflection). Instead, the two
Pentaprism
Flight condition in helicopters
have a critical angle of attack (also called a stall angle of attack) which is the angle of attack that produces most lift. Above this angle flow over
Retreating_blade_stall
Study of the performance, stability, and control of flying vehicles
represented by two critical angles, the angle of attack of the wing ("alpha") and the angle of attack of the vertical tail, known as the sideslip angle ("beta")
Flight_dynamics
Part of an optical fiber that carries light
internal reflection, as long as the angle between the light and the boundary is greater than the critical angle. As a result, the fiber transmits all
Core_(optical_fiber)
Practical physics application
Photons arriving at the surface more obliquely, with incidence angle exceeding the critical angle, undergo total internal reflection, and return inside the
Light-emitting_diode_physics
1985 plane crash in the north-central Uzbek SSR
aircraft up, making the Tu-154 on the verge of activating the alarm of the critical angle of attack; suddenly, the alarm had stopped due to a blown fuse. The
Aeroflot_Flight_5143
Material made from a combination of two or more unlike substances
_{c_{1}}} is the critical angle between longitudinal fracture and shear failure, and θ c 2 {\displaystyle \theta _{c_{2}}} is the critical angle between shear
Composite_material
Aircraft control maneuver where the pilot combines a 180° turn with a climb
change of heading, the aircraft has the maximum pitch angle (which should be close to the critical angle of attack at the level stall speed of the aircraft)
Chandelle
Group of eye diseases related to poor retinal and nerve perfusion
different types of glaucoma, the most common are called open-angle glaucoma and closed-angle glaucoma. Inside the eye, a liquid called aqueous humor, which
Glaucoma
Mechanical device in an aircraft cockpit to warn the pilot of an imminent stall
to pilots reacting improperly. When many small aircraft approach the critical angle of attack that will result in an aerodynamic stall, the smooth flow
Stick_shaker
Highly-polished material in particle physics
effective critical angle can be made by exploiting diffraction (with non-zero losses) that occurs from stacked multilayers. The critical angle of total
Neutron_supermirror
Type of field where the net flow of electromagnetic energy is zero
reflection at its boundary because they strike it at an angle greater than the critical angle. The physical explanation for the existence of the evanescent
Evanescent_field
Inclination of road or surface other than flat
})}}} Where θ c r i t {\displaystyle \theta _{\mathrm {crit} }} is the critical angle, such that tan θ c r i t = μ s {\displaystyle \tan \theta _{\mathrm
Banked_turn
Surface analytical technique
roughness). Thin film thickness and critical angle can also be approximated with a linear fit of squared incident angle of the peaks θ 2 {\displaystyle \theta
X-ray_reflectivity
Situation or phenomena, When light bounces off a material with a low index of refraction
optically denser than the second medium, and the incident angle is larger than the critical angle of the medium, for example, light that starts in water
Total_external_reflection
Optical polarizer made of two birefrengent calcite crystals
calcite–glue interface because of its angle of incidence at the glue layer (refractive index n = 1.550) exceeds the critical angle for the interface. It passes
Nicol_prism
relative wind is of great importance to pilots because exceeding the critical angle of attack will result in a stall, regardless of airspeed. Relative wind
Relative_wind
Analysis of facts to form a judgment
fields of study may require different types of critical thinking. Critical thinking provides more angles and perspectives upon the same material. The study
Critical_thinking
Pair of telescopes mounted side-by-side
incident at one of the prism's glass-air boundaries at an angle less than the critical angle so total internal reflection does not occur. Without a mirror
Binoculars
1999 studio album by Hybrid
Wide Angle is the debut studio album by Welsh breakbeat group Hybrid. It was released to critical acclaim, described by The Times as "one of the most moving
Wide_Angle
2012 cruise ship sinking off the Italian coast
of submarine platforms; Parbuckling of the wreck, rotating it past a critical angle of about 24° from its resting position, beyond which the sponsons would
Costa_Concordia_disaster
the critical angle. When the emitter is located just 200 nm above the surface, fluorescent light entering the solid body above the critical angle is decreased
Supercritical angle fluorescence microscopy
Supercritical_angle_fluorescence_microscopy
Device to detect water from rain
infrared light is beamed at a 45-degree angle into the windshield from the interior. If the glass is dry, the critical angle for total internal refraction is
Rain_sensor
Family of insects
gets deeper and deeper, until the slope angle reaches the critical angle of repose (that is, the steepest angle the sand can maintain, where it is on the
Antlion
under an exit angle αf that is close to the critical angle for total external reflection αc. For x-rays and neutrons, critical angles are small, and
Yoneda_peak
Flight instrument
any speed, so monitoring the ASI alone will not prevent a stall. The critical angle of attack (AOA) determines when an aircraft will stall. For a particular
Airspeed_indicator
1972 aircraft accident in England
thus reducing its airspeed. The Trident entered a deep stall after a critical angle of attack was reached. Eventually, it entered a flat spin and appeared
British European Airways Flight 548
British_European_Airways_Flight_548
Medical condition
(Type A), middle (Type B) or posterior (Type C). The Angle of Gissane, or "Critical Angle", is the angle formed by the downward and upward slopes of the calcaneal
Calcaneal_fracture
American Dungeons & Dragons web series
Critical Role is an American web series in which a group of professional voice actors play Dungeons & Dragons. The show started streaming partway through
Critical_Role
Science dealing with natural and artificial gemstone materials
bends will vary depending on the gem mineral. Every material has a critical angle, above which point light is reflected back internally. This can be measured
Gemology
Mode of flight
cross section and streamlining. As lift increases steadily until the critical angle, it is normally the point where the combined drag is at its lowest,
Gliding_flight
Network protocol supporting distributed directory information services
International, circa 1993, as a successor to DIXIE and DAS. Mark Wahl of Critical Angle Inc., Tim Howes, and Steve Kille started work in 1996 on a new version
Lightweight Directory Access Protocol
Lightweight_Directory_Access_Protocol
Concept in geometry and physics
around the Earth, depending on the angle the plane makes with the Earth's equator. For planes that are at a critical angle this can mean that the plane will
Orbital_plane
Kepler-Poinsot polyhedron
adjusted so that the five triangles in the pentagram become coplanar. The critical angle is atan(2) above the dodecahedron face. Equivalently, this occurs when
Small_stellated_dodecahedron
Modern aircraft instrument
updated as required; the stall angle, for example, can be adjusted in real time to reflect the calculated critical angle of attack of the aircraft in its
Primary_flight_display
Yawing force caused by a rotating propeller
propeller's center of thrust moves off-center when the aircraft is at a high angle of attack. This shift in the location of the center of thrust will exert
P-factor
Microscope observing a thin depth of a cell
through the objective at its ends, allowing for the angle to be sufficiently greater than the critical angle. The beam must also be focused at the BPF because
Total internal reflection fluorescence microscope
Total_internal_reflection_fluorescence_microscope
Practice of drilling non-vertical bores
"drilling ahead" (not making active changes to angle and direction). During critical angle and direction changes, especially while using a downhole motor, a measurement
Directional_drilling
Process constraining a charged particle's path through a crystal
angle deviation occurs during the oscillation of the particle until the angle goes beyond a critical angel for channeling and introduces large angle scattering
Channelling_(physics)
continued stress, the misorientation angle increases until the critical angle is achieved, creating a high angle grain boundary. This evolution can be
Dynamic_recrystallization
2001 aviation accident
automatic control system could not cause the aircraft to exceed the critical angle of attack and g-forces. They added that the on board computer would've
Vladivostok_Air_Flight_352
Multiple-beam interferometer
plate, striking the faces at an angle just below the critical angle as it propagates along. Because of the steep angle of incidence, nearly all of the
Lummer–Gehrcke_interferometer
Flexible optical fiber bundle with an eyepiece on one end and a lens on the other
the core acts like a perfect mirror and the angle of the light is always larger than the critical angle. Eyepiece – Magnifies the image carried back
Fiberscope
Satanic and left-hand path occultist group
The Order of Nine Angles (ONA or O9A) is a Satanic left-hand path network that originated in the United Kingdom, but has since branched out into other
Order_of_Nine_Angles
English YouTuber and actress (born 1993)
which initially focused on the James Bond films. The podcast takes a critical angle, attempting in the words of its creators to "give 007 the socialist
Abigail_Thorn
Fatal auto racing accident
the track. Earnhardt collided head-on into the retaining wall at a critical angle with his car going an estimated speed between 155 and 160 miles per
Death_of_Dale_Earnhardt
Raptorial winged insects
lift like an aircraft wing; supercritical lift with the wing above the critical angle, generating high lift and using very short strokes to avoid stalling;
Dragonfly
Fighter aircraft tactical maneuvers not possible using only aerodynamic techniques
the control surfaces and thus the maneuverability. If the angle of attack exceeds its critical value, the airplane will stall. Pilots are trained to avoid
Supermaneuverability
Airfoil designed primarily to delay the onset of wave drag in the transonic speed range
boundary layer ahead of the bubble, even at relatively low speed. At the critical angle, the bubble rapidly expands ("bursts"), causing airflow to suddenly
Supercritical_airfoil
(L—lift). As the angle of attack grows larger, the lift reaches a maximum at some angle; increasing the angle of attack beyond this critical angle of attack
Forces_on_sails
Analog instrument for measuring a liquid's refractive index
instrument for measuring a liquid's refractive index. It works on the critical angle principle by which lenses and prisms project a shadow line onto a small
Traditional handheld refractometer
Traditional_handheld_refractometer
United States Navy sailor (1961–2023)
to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack, which resulted in a loss of control while maneuvering for
Howard_E._Wasdin
Optical component which splits light into several beams
that in a CD/DVD is seen. This is due to viewing angle (less than the critical angle of reflection of the black vinyl) and the path of the light being reflected
Diffraction_grating
Critical Frequency changes with time of day, atmospheric conditions and angle of fire of the radio waves by antenna. The existence of the critical frequency
Critical_frequency
Optical prism used to rotate an image by 180°
maximized image contrast. As the incidence angle on the lower surface of the lower prism is less than the critical angle, total internal reflection does not
Schmidt–Pechan_prism
Application of critical theory
terrorism studies from a critical angle, that is, to encourage and further the adoption of a more self-consciously critical approach to the study of terrorism
Critical_terrorism_studies
Brand of optical fiber cable
critical angle; when the light beam approaches the interface at a shallow angle most of it will be reflected, but as it gets closer to the critical angle
ClearCurve
Topics referred to by the same term
fluid dynamics, a sudden reduction in lift from exceeding a foil's critical angle of attack (such as when a plane climbs too steeply and slowly) Compressor
Stalling
Narrow canyon hazardous to aircraft
and the bank angle is as follows: R = V 2 11.26 ⋅ t a n ( bank angle ) {\displaystyle R={\frac {V^{2}}{11.26\cdot tan({\text{bank angle}})}}} While flying
Box_canyon_(aviation)
Rapid flow of a mass of snow down a slope
the greatest incidence when the snow's angle of repose is between 35 and 45 degrees; the critical angle, the angle at which human-triggered avalanches are
Avalanche
Airport in Michigan, United States
crosswind conditions, which resulted in the airplane exceeding its critical angle of attack and an aerodynamic stall. List of airports in Michigan "FAA
Sault Ste. Marie Municipal Airport
Sault_Ste._Marie_Municipal_Airport
Streamlined body for generating lift
its angle of attack. Most foil shapes require a positive angle of attack to generate lift, but cambered airfoils can generate lift at zero angle of attack
Airfoil
Diffraction using small incidence angles
(GID) is a technique for interrogating a material using small incidence angles for an incoming wave, often leading to the diffraction being surface sensitive
Grazing_incidence_diffraction
Flight path putting aircraft in unusual attitudes
the aircraft is pulled up suddenly. The aircraft pitches up to 90–120° angle of attack. The nose then falls back to the horizontal, and the aircraft
Aerobatic_maneuver
Shape with three sides
has three internal angles, each one bounded by a pair of adjacent edges; the sum of angles of a triangle always equals a straight angle (180 degrees or π
Triangle
Type of microscopic technique used for imaging surfaces by tunneling of photons
probe tip. A beam of light is focused on a prism at an angle greater than the critical angle of the refractive medium in order to induce total internal
Photon_scanning_microscopy
Active transform fault in Canada and Alaska
the central QCF segment as a result of convergence decreasing below a critical angle of approximately 15°. In the northern segment, which bore the epicenter
Queen_Charlotte_Fault
Private airport near Daytona Beach, FL, US
back to the runway, which resulted in an exceedance of the airplane's critical angle of attack and an aerodynamic stall. On July 5, 2018, an experimental
Spruce_Creek_Airport
Angle in certain right triangles in the hyperbolic plane
In hyperbolic geometry, angle of parallelism Π ( a ) {\displaystyle \Pi (a)} is the angle at the non-right angle vertex of a right hyperbolic triangle
Angle_of_parallelism
Scientific methodology
scientific explanation's covering law model, which is also termed, from critical angle, subsumption theory. The term deductive distinguishes the DN model's
Deductive-nomological_model
used within food and liquid analysis. Most operate on the same general critical angle principle as a traditional handheld refractometer but are more precise
Digital handheld refractometer
Digital_handheld_refractometer
Physical property of allowing light
an angle greater than the critical angle, only light that enters the fiber within a certain range of angles will be propagated. This range of angles is
Transparency_and_translucency
Small lifting surface of a fixed-wing aircraft
such that it aligned with the stabiliser leading-edge root at the critical angle. Using a computer to control the elevator allows aerodynamically unstable
Tailplane
CRITICAL ANGLE
CRITICAL ANGLE
Boy/Male
Arabic, Muslim
A Critic; A Reviewer
Boy/Male
Muslim
A critic, A reviewer, Fault finder
Boy/Male
Arabic, Muslim, Sindhi
Fault-finder; Critic; Reviewer
Surname or Lastname
English
English : habitational name from a place in Devon called Huxford (preserved in the name of Huxford Farm), from the Old English personal name HÅcc or the Old English word hÅc ‘hook or angle of land’ + ford ‘ford’.
Surname or Lastname
English and Irish (of Norman origin)
English and Irish (of Norman origin) : topographic name from Middle English and Old French angle ‘angle’, ‘corner’ (Latin angulus). As an Irish surname, it can also be habitational, from a place in Pembrokeshire, South Wales, named with this word.Americanized spelling of German Angel or Engel.
Boy/Male
Arabic
Critic; Reviewer
Boy/Male
Arabic, Muslim
A Critic; A Reviewer; A Fault-finder
Boy/Male
Indian
A critic, A reviewer, Fault finder
Boy/Male
British, English
From Anglesey
Girl/Female
Tamil
Pari fairy
Girl/Female
Biblical
Criminal, abominable.
Biblical
criminal; abominable
Boy/Male
Indian
A critic, A reviewer, Fault finder
Surname or Lastname
English
English : from the Middle English personal name Ingelot, a pet form of any of various names such as Ingelbald ‘Angle bold’, Ingelbert ‘Angle bright’, or Ingelard ‘Angle hardy’. These were names of Germanic origin, introduced to Britain by the Normans or possibly by the Danish invaders a century earlier.
Surname or Lastname
English
English : topographic name for someone who lived by a piece of ground that had been cleared by fire, from Middle English brend, past participle of brennen ‘to burn’.English : habitational name from any of the places in Devon and Somerset named Brent, probably from Old English brant ‘steep’, or from an old Celtic (British) word meaning ‘hill’, ‘high place’.English : byname or nickname for a criminal who had been branded; compare Henry Brendcheke (‘burned cheek’), recorded in Northumbria in 1279.English : Giles Brent (died 1672) came from Gloucestershire, England, to MD in 1638.
Boy/Male
Latin
Critical.
Surname or Lastname
English
English : from Old English Englisc. The word had originally distinguished Angles (see Engel) from Saxons and other Germanic peoples in the British Isles, but by the time surnames were being acquired it no longer had this meaning. Its frequency as an English surname is somewhat surprising. It may have been commonly used in the early Middle Ages as a distinguishing epithet for an Anglo-Saxon in areas where the culture was not predominantly English--for example the Danelaw area, Scotland, and parts of Wales--or as a distinguishing name after 1066 for a non-Norman in the regions of most intensive Norman settlement. However, explicit evidence for these assumptions is lacking, and at the present day the surname is fairly evenly distributed throughout the country.Irish : see Golightly.
Surname or Lastname
English
English : habitational name from a place in Staffordshire named Engleton, from Old English Engla (genitive plural of Engle ‘Angle’) + tūn ‘settlement’.
Boy/Male
Muslim
A critic, A reviewer, Fault finder
Boy/Male
Arabic
Critic; Reviewer
CRITICAL ANGLE
CRITICAL ANGLE
Girl/Female
Indian
Victorious; Auspicious Victory
Male
Egyptian
, an Egyptian deity worshipped in Nubia.
Boy/Male
Indian, Punjabi, Sikh
Holy Like God
Male
Swedish
Norwegian and Swedish form of Old Norse ÞorgÃsl, TORGILS means "Thor's arrow."Â
Boy/Male
Arabic, Muslim
Servant of the Depraver
Boy/Male
German
Bright Fame; Famous
Girl/Female
Indian, Telugu
Giving Protection
Boy/Male
Arabic
Writer; Recorder
Girl/Female
Tamil
Star, The pupil of the eye, Meteor, Fragance
Boy/Male
Muslim
Goodness
CRITICAL ANGLE
CRITICAL ANGLE
CRITICAL ANGLE
CRITICAL ANGLE
CRITICAL ANGLE
a.
Of or pertaining to critics or criticism; critical.
n.
Inclined to criticise or find fault; fastidious; captious; censorious; exacting.
a.
Involving a crime; of the nature of a crime; -- said of an act or of conduct; as, criminal carelessness.
n.
Pertaining to criticism or the critic's art; of the nature of a criticism; accurate; as, critical knowledge; a critical dissertation.
n.
Inclined to make nice distinctions, or to exercise careful judgment and selection; exact; nicely judicious.
n.
Any critical period.
n.
Pertaining to, or indicating, a crisis, turning point, or specially important juncture; important as regards consequences; hence, of doubtful issue; attended with risk; dangerous; as, the critical stage of a fever; a critical situation.
a.
Over critical; unreasonably or unjustly critical; carping; captious.
a.
Severely critical.
adv.
At a crisis; at a critical time; in a situation, place, or condition of decisive consequence; as, a fortification critically situated.
n.
One who is critical beyond measure or reason; a carping critic; a captious censor.
a.
Belonging to, or consisting of, bark or rind; resembling bark or rind; external; outer; superficial; as, the cortical substance of the kidney.
n.
Characterized by thoroughness and a reference to principles, as becomes a critic; as, a critical analysis of a subject.
a.
Relating to a climacteric; critical.
a.
Relating to crime; -- opposed to civil; as, the criminal code.
adv.
In a critical manner; with nice discernment; accurately; exactly.
a.
Having no crisis; giving no indications of a crisis; as, acritical symptoms, an acritical abscess.
n.
Qualified to criticise, or pass judgment upon, literary or artistic productions.
a.
Serving to determine; critical.
v. i.
To criticise; to play the critic.