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A point source of light S is placed at the bottom of a vessel containg a liquid of refractive index `5//3.` A person is viewing the source from above the surface. There is an opaque disc of radius `1 cm` floating on the surface. The centre of the disc lies vertically above the source S. The liquid from the vessel is gradually drained out through a tap. What is the maximum height of the liquid for which the source cannot at all be seen from above?

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Best answer
Correct Answer - C::D
See the result of sample example
`R=h/(sqrt(u^2-1))`
`h=Rsqrt(u^2-1)`
`=(1 cm)sqrt((5//3)^2-1)=4/3 cm`

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