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Q.

In a compound microscope, the length of microscope is 21.5 cm, the focal length of the objective is 1.6 cm, the focal length of the eye piece is 2.1 cm and if final image is formed at infinity. Then the distance of the object from the objective lens is

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a

3 cm

b

1.7 cm

c

6 cm

d

4.82 cm

answer is B.

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Detailed Solution

The image formed by the objective should be at the focus of the eye piece. HereV0=21.5−2.1cm=19.4cm ∴ 1+19.4 − 1u= 1+1.6 ⇒ u=−1.7cm

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