Critical Angle

least angle of incidence for total reflection (Optics)

Total internal reflection is an optical phenomenon that occurs when a ray of light strikes a medium boundary at an angle larger than the critical angle with respect to the normal to the surface. If the refractive index is lower on the other side of the boundary no light can pass through, so effectively all of the light is reflected. The critical angle is the angle of incidence above which the total internal reflection occurs.
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Noun
1. the smallest angle of incidence for which light is totally reflected
(hypernym) angle of incidence, incidence angle

In geometric optics, at a refractive boundary, the smallest angle of incidence at which total internal reflection occurs. (188 ) Note 1: The angle of incidence is measured with respect to the normal at the refractive boundary. Note 2: The critical angle is given by where c is the critical angle, n 1 is the refractive index of the less dense medium, and n 2 is the refractive index of the denser medium. Note 3: The incident ray is in the denser medium. Note 4: If the incident ray is precisely at the critical angle, the refracted ray is tangent to the boundary at the point of incidence.

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