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A microscope is focussed on a coin lying...

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 ? (Refration index of water is `4//3`)

A

1 cm

B

`(4)/(3)` cm

C

3 cm

D

4 cm

Text Solution

Verified by Experts

The correct Answer is:
D
Normal shift (d) `= h(1 - (1)/(n))`
`rArr " " 1 = h (1 - (3)/(4)) rArr h = 4 ` cm.
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