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Question

A microscope is focused on a mark, then a glass slab of refractive index 1.5 and thickness of 3 cm is placed on the mark to get the mark again in focus, the microscope should be moved

A
4cm
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B
2cm
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C
6cm
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D
8cm
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Solution

The correct option is B 2cm
Given,
μ=1.5
Real depth, h=3cm
lets consider, h= apparent depth
The refractive index is the ratio of real depth and the apparent depth,
μ=hh
h=hμ=3cm1.5=2cm
The correct option is B.

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