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Q.

Magnification of a compound microscope is 30. Focal length of eye –piece is 5 cm and the image is formed at a distance of distinct vision of 25 cm. The magnification of the objective lens is 

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a

6

b

5

c

7.5

d

10

answer is B.

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Detailed Solution

n=vouo(1+Dfe)=mo(1+Dfe)⇒20=mo(1+255)=mo×6⇒mo=5

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Magnification of a compound microscope is 30. Focal length of eye –piece is 5 cm and the image is formed at a distance of distinct vision of 25 cm. The magnification of the objective lens is