the dot is invisible.

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A jar of height h is filled with a transparent liquid of refractive index μ, Fig. At the centre of the jar on the bottom surface is a dot. Find the minimum diameter of a disc, such that when placed on the top surface symmetrically about the centre, the dot is invisible.
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Nov
A jar of height h is filled with a transparent liquid of refractive index μ, Fig. At the centre of the jar on the bottom surface is a dot. Find the minimum diameter of a disc, such that when placed on the top surface symmetrically about the centre, the dot is invisible. A jar of [...]
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Tags: A jar of height h is filled with a transparent liquid of refractive index μ , Fig. At the centre of the jar on the bottom surface is a dot. Find the minimum diameter of a disc , such that when placed on the top surface symmetrically about the centre , the dot is invisible. ,