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A point source of light is placed 4 m be...

A point source of light is placed 4 m below the surface of water of refractive index `(5)/(3).` The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut off light coming out of water is

A

2 m

B

6 m

C

4 m

D

3 m

Text Solution

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The correct Answer is:
b
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