A travelling microscope is focussed on to a scratch on the bottom of a beaker. Water of refractive index `(4)/(3)` is poured in it. Then the microscope is to be lifted through 2 cm focus it again. Find the depth of water in the beaker.

A travelling microscope is focussed on a mark made on a paper. When a slab of 1.45cm thickness is placed on the marl, the microscope has to be raised through 0.49 cm to focus the mark again. Calculate the refractive index of glass.

A microscope is focussed on the scratch at the bottom of a beaker. Water is pured into it and the microscope is focussed again on the scratch at the bottom of the beaker. Some lycopodium power is sprinkled on the surface of water and microscope is focussed on to the powder. The corresponding readings are 1.17, 2.02 and 4.57 cm respectively, the refractive index of water is

A vertical microscope is focussed on a point at the bottom of an empty tank. Water ( mu = 4//3 ) is then poured into the tank. The height of the water column is 4cm. Another lighter liquid, which does not mix with water and which has refractive index 3/2 is then poured over the water.The height of liquid column is 2cm. What is the vertical distance through which the microscope must be moved to bring the object in focus again ?

A microscope is focussed ona mark on a piece of paper then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark.How should the microscope be moved to get the mark in focus again?

A microscope is focussed on an ink mark on the top of a table. If we place a glass slab of 3 cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass is 1.5

A microscope is focussed on an ink mark on the top of a table. If we place a glass slab of 3 cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass is 1.5

A microscope is focussed on an ink mark on th top of a table. If we place a glass slab of 3 cm thick on it, how should the microscope be moved to focus the ink spot again ? The refractive index of glass is 1.5.

A microscope is focussed on an ink mark on the top of a table. If we place a glass slab 3 cm thick on it, how should the microscope be moved to focus the ink spot again ? The refractive index of glass is 1.5