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Q.

A compound microscope has an objective of focal length 2 cm and eye piece of focal length 5 cm. An object is placed 2.4 cm in front of the objective. If the final image is at infinity, the  magnifying power is ___

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a

36

b

25

c

40

d

30

answer is A.

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Detailed Solution

detailed_solution_thumbnail

1v0−1u0=1f0⇒1v0+12.4=12⇒v0=12

m=v0u0Dfe

m=122.4×255=25

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