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Q.

A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective so that final image is formed at the least distance vision (20 cm)

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a

12

b

11

c

10

d

13

answer is A.

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Detailed Solution

For objective lens 1fo=1vo−1uo⇒1vo=1fo+1uo=14+1−5=120⇒v0=20cm  Now M=vouo1+Dfe=2051+2010=12.
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