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Q.

A transparent solid cylindrical rod has a refractive index of 23. It is surrounded by air. A light ray is incident at the midpoint of one end of the rod as shown in the figure.The incident angle θ for which the light ray grazes along the wall of the rod is

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a

sin-132

b

sin-123

c

sin-113

d

sin-112

answer is C.

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Detailed Solution

c = 90–r(1) sin90= μsinc = μcos r⇒cos r=1μ=32, r=30o(1) sinθ = μsin rsinθ=23 x 12=13 ; sinθ=13 θ=sin-113
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