Question

A point source of light is placed 12m below the surface of water of refractive index 53 .find the minimum diameter of the disc, which should be placed over the source,on the surface of water to cut of all light coming out of water

Answer 1

Answer:

The diameter of a disc is 6 m.

Explanation:

Given that,

Height h = 4 m

Refractive index

The diameter of a disc is

The radius of the disc is given by

Here, h = height

n = refractive index

Hence, The diameter of a disc is 6 m.

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