A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness `3cm` 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 a mark on a piece of paper and 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 again in focus ?

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 travelling microscope can move vertically along a scale. It is focused at a mark O on the table and the reading on the vertical scale is r_(1) . Now a glass slab is placed over mark O and the microscope has to be moved up to bring the mark in focus again. This time the scale reads r_(2) . Lycopodium powder is spread over the top of the glass slab and the microscope is moved up once again to bring the powder particles in sharp focus. This time the vertical scale reads r_(3) . Find the refractive index of the material of the glass slab.

An ink mark on a sheet of paper is viewed through a glass slab of thickness t and refractive index mu . Through what distance the mark appears to be raised ?

The time taken by a ray of light to travel through a glass slab of thickness 2 cm and refractive index 1.5 will be

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 arranged to observe a mark on a piece of paper clearly. Now if a cube of refractive index 1.5 and thickness 3 cm is placed on this mark, then now what should be the displacement given to microscope to observe the mark clearly again ?

A small ink dot on a paper is seen through s glass slab of thickness 4 cm and refractive index 1.5 . The dot appears to be raised by

A small ink dot on a paper is viewed through a glass slab of thickness 10 cm , and refractive index 1.5 . By what distance would the dot appear to be raised ?

A small ink dot on a paper is viewed through a glass slab of thickness 10cm and refractive index 1.5. By what distance would the dot appear to be raised?