Optics Question 764

Question: A microscope is focussed on a coin lying at the bottom of a beaker. The microscope is now raised up by 1 cm. To what depth should the water be poured into the beaker so that coin is again in focus? (Refractive index of water is $ \frac{4}{3} $ )

[BHU 2003]

Options:

A) 1 cm

B) $ \frac{4}{3} $ cm

C) 3 cm

D) 4 cm

Show Answer

Answer:

Correct Answer: D

Solution:

Suppose water is poured up to the height h, So $ h( 1-\frac{1}{\mu } )=1 $

$ \Rightarrow h=4\ cm $



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