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Q.

A ray of light falls on a transparent sphere with centre at C as shown in figure. The ray emerges from the sphere parallel to line AB. The refractive index of the sphere is

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a

2

b

3

c

3/2

d

1/2

answer is B.

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Detailed Solution

Deviation by a sphere is 2(i - r)Here deviation δ = 60° =2 (i - r)or i - r=30°∴ r = 60° - 30° = 30°∴μ=sin isin r=sin 600sin 30o=3
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