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Q.

A point source of light is placed 4 m below the surface of water of refractive index 53. The minimum diameter of a disc which should be placed over the source on the surface of water to cut–off all light coming out of water is

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a

4 m

b

3 m

c

2 m

d

6 m

answer is B.

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Detailed Solution

 Here sini=1μ=35 and hence tani=34=r4  This gives r=3m, hence diameter =6m

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