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Q.

A glass prism has refractive index 2, and refracting angle 30°. One of the refracting surface of the prism is silvered. A beam of monochromatic light will retrace it path if its angle of incidence on the unsilvered refracting surface of the prism is

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a

0

b

π/6

c

π/4

d

π/3

answer is C.

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Detailed Solution

A =r1+r2 30°=r1+0 or    r1=30° Now,    sin isin 30°=2 or sin = 2×12 or   i = 45°
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