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Sahay Sir > Question Answers > NCERT Exemplar Class 12 > Physics > Chapter 9 - Ray Optics and Optical Instruments > 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 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 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.