A point source of light \( S \) is placed at the bottom of a vessel containing a liquid of refra...

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A point source of light \( S \) is placed at the bottom of a vessel containing a liquid of refractive index \( 5 / 3 \). A person is
P viewing the source from above the surface. There is an opaque
\( \mathrm{W} \) disc of radius \( 1 \mathrm{~cm} \) floating on the surface. The centre of the disc lies vertically above the source \( S \). The liquid from the vessel is gradually drained out. What is the maximum height of the liquid for which the source cannot be seen from above?
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