A jar of height h is filled wih a transparent liquid of refractive index `mu`, Fig. At the centre of the jar on the botom 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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A jar of height h is filled with a transparent liquid of refractive index mu (Fig. EP 9.26). At the centre of the jar on the bottom surface is a dot. Find the minimum diamter 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 mu (See figure). 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 symmertically aobut the centre , the dot is invisible

A jar of height h is filled with a transparent liquid of refractive index mu as shown in Fig.6.05. 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 small source of light is 4m below the surface of a liquid of refractive index 5//3 .In order to cut off all the light comingout of liquid surface,minimum diameter of the disc placed on the surface of liquid is

A rectangulat block of refractive index mu is placed on a printed page lying on a horizontal surface as shown in Fig. , Find the minimum value of mu so that the letter L on the page is not visible from any of the vertical sides.

A rectangulat block of refractive index mu is placed on a printed page lying on a horizontal surface as shown in Fig. , Find the minimum value of mu so that the letter L on the page is not visible from any of the vertical sides.

A rectangulat block of refractive index mu is placed on a printed page lying on a horizontal surface as shown in Fig. , Find the minimum value of mu so that the letter L on the page is not visible from any of the vertical sides.

A large rectangular glass block of refractive index mu is lying on a horizontal surface as shown in Figure. Find the minimum value of mu so that the spot S on the surface cannot be seen through top plane ‘ABCD’ of the block.