JEE Main 2017 Physics question
Let the refractive index of a denser medium with respect to rarer medium be and its critical angle be . At an angle of incidence when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is . Angle is given by:
Answer: (1)
Solution
Let be the angle of refraction. The reflected ray makes angle with the normal on the far side, and the refracted ray makes angle on the other side, so the angle between them is . Setting this to ,
r = 90° - A.
Snell's law for denser rarer travel reads $ A =
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