A ray R₁ is incident on the plane surface of the glass slab (kept in air) of refractive index √2 at an angle of incidence equal to the critical angle for this air glass system. The refracted ray R₂ undergoes partial reflection and refraction at the other surface. The angle between reflected ray R₃ and the refracted ray R₄ at that surface is (in degree) :
Physics · Geometrical optics · law of refraction and total internal reflection
A ray R₁ is incident on the plane surface of the glass slab (kept in air) of refractive index √2 at an angle of incidence equal to the critical angle for this air glass system. The refracted ray R₂ undergoes partial reflection and refraction at the other surface. The angle between reflected ray R₃ and the refracted ray R₄ at that surface is (in degree) :
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