Question

A travelling microscope is focussed on a mark on a piece of paper and the scale reading is A. A rectangular block of glass is placed on the paper and the microscope is raised and focussed the mark on the paper, then microscope reading is B. A layer of lycopodium powder is sprinkled on the block of glass, the reading now is C. The refractive index of the material of the block is

A

B

C

D

Medium
Solution
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Correct option is B)

The refractive index of the glass slab will be equal to,


Now, for the given case, Real Depth = C - A

Apparent depth = C - B 

Thus,

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