Question

Q. A microscope is focused at a coin placed in an empty beaker. Microscope is moved vertically up
by 2cm. By what level should a liquid of refractive index 1.5 be filled in beaker to bring the coin back
in focus of microscope?

Answer 1

Answer:

y

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A microscope is focused 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

3

4

)

Medium

Solution

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Correct option is D)

Water should be poured to a height h cm so that apparent shift in position of coin is 1 cm.

As y=(1−

n

1

)h

⇒h=

(1−

n

1

)

y

=

(1−

4/3

1

)

1

=

4

1

1

=4cm