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Q.

An object P is focused by a microscope M. a glass slab of thickness 2.1 cm is introduced between P and M.. If the refractive index of the slab is 1.5, the distance should the microscope be shifted to focus the object again is

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a

2.7 cm

b

0.6 cm

c

0.7 cm

d

1 cm

answer is A.

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Detailed Solution

The thickness of the glass is d = 2.1 cm and μ=1.5 shift due to the glass slab 

ΔT=[1−1μ]d=[1−11.5]2.1=0.7cm

So, the microscope should be shifted 0.70 cm to focus from the object again

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