critical angle

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critical angle

1. The smallest angle of incidence at which a light ray passing from one medium to another less refractive medium can be totally reflected from the boundary between the two.
2. The angle of attack of an airfoil at which airflow abruptly changes, causing changes in the lift and drag of an aircraft.

critical angle

1. (General Physics) the smallest possible angle of incidence for which light rays are totally reflected at an interface between substances of different refractive index
2. (Aeronautics) another name for stalling angle

crit′ical an′gle

1. the minimum angle of incidence beyond which total internal reflection occurs for light traveling from a medium of higher to one of lower index of refraction.
2. the angle of attack at which a sudden change in airflow occurs around the wings of an aircraft, reducing lift and increasing drag.

crit·i·cal angle

The smallest angle of incidence at which a light ray can be completely reflected from the boundary between two media.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.critical angle - the smallest angle of incidence for which light is totally reflected
angle of incidence, incidence angle - the angle that a line makes with a line perpendicular to the surface at the point of incidence
References in periodicals archive ?
Looking at another critical angle, if we examine the supplies needed in the coming years, we must meet not only demand growth, but also make up the natural decline of legacy fields,' he said.
But it's a critical angle that activists need to develop.
13[degrees] which is higher than the critical angle of the PTB7:P[C.
6[degrees] will be refracted and can be seen underwater, while outside of the critical angle, it will be reflected away.
Total internal reflection (TIR) is an optical phenomenon when light travels from material (medium) with lower optical density to a secondary material (medium) with higher optical density at a light incidence angle greater than specific critical angle, then refraction becomes equal to 90[degrees] and theoretically all light energy is reflected at the boundary surface, none is transmitted:
Because this feature indicates that each state is stable around a critical angle, the transition is believed to be triggered by some instantaneous disturbances.
There seems to be a critical angle of incidence determining whether a bullet dives down into the water or bounces off into the stratosphere.
The angle of incidence that yields an angle of refraction of 90[degrees] is the critical angle.
If you get it just right, the light will hit the boundary at a critical angle and will bounce back without exiting the jelly.
If you feel shaking through the seat of your pants, the problem is probably the wing--as redesigned by ice--ap-proaching its critical angle of attack.
There is also an audible "Geiger counter" clicking heard through the headset that increases in speed the closer the SCx shows to the critical angle of attack.
Oh Yong-seok, a helmsman on the ferry with 10 years of shipping experience, said that when the crew gathered on the bridge and sent a distress call, the ship was already listing more than 5 degrees, the critical angle at which a vessel can be brought back to even keel.

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