KVPY SX SB Exam 2013 Question Paper

Question : 35 of 120

Marks: +1, -0

A ray of light incident on a glass sphere (refractive index

√3

) suffers total internal reflection before emerging out exactly parallel to the incident ray. The angle of incidence was

Solution:

\∠i=2∠\r

{\sin i}/{\sin r}=√3

2\cos r=√3

r = 30° & i = 60°
Note : But for r = 30° TIR cannot take place at B.

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