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The water in a pond has a refractive ind...

The water in a pond has a refractive index `(5)/(3)`. A source of light is placed 4 m below the surface of water. Calculate the minimum radius of an opaque disc needed to be floated on water so that light does not come out.

Text Solution

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Minimum radius of the opaque disc,
`r = (h)/(sqrt(mu^(2) - 1)) = (4)/(sqrt(((5)/(3))^(2)-1)) = ((4)/(4))/((4)/(3)) = 3 cm`
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