A coin is kept at bottom of an empty beaker. A travelling microscope is focussed on the coin from top, now water is poured in beaker up to a height of 10 cm. By what distance and in which direction should the
microscope be moved to bring the coin again in focus

10 cm upward

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10 cm downward

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2.5 cm upwards

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2.5 cm downwards

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Solution

The correct option is C 2.5 cm upwards
When water is poured in the beaker. Coin appears to shift by a distance $d = \frac{h}{4} = \frac{10}{4} = 2.5 c m$
Hence to bring the coil again in focus, the microscope should be moved by 2.5 cm in upward direction.

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A coin is kept at bottom of an empty beaker. A travelling microscope is focussed on the coin from top, now water is poured in beaker up to a height of 10 cm. By what distance and in which direction should the microscope be moved to bring the coin again in focus

The correct option is C 2.5 cm upwardsWhen water is poured in the beaker. Coin appears to shift by a distance d=h4=104=2.5cm Hence to bring the coil again in focus, the microscope should be moved by 2.5 cm in upward direction.

A coin is kept at bottom of an empty beaker. A travelling microscope is focussed on the coin from top, now water is poured in beaker up to a height of 10 cm. By what distance and in which direction should the
microscope be moved to bring the coin again in focus

The correct option is C 2.5 cm upwards
When water is poured in the beaker. Coin appears to shift by a distance $d = \frac{h}{4} = \frac{10}{4} = 2.5 c m$
Hence to bring the coil again in focus, the microscope should be moved by 2.5 cm in upward direction.