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Q.

In a compound microscope the focal length of objective lens is 1.2 cm and focal length of eye piece is 3.0 cm. when object is kept at 1.25 cm in front of objective, final image is formed at infinity. Magnifying power of the compound microscope should be :

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a

150

b

200

c

400

d

100

answer is B.

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Detailed Solution

1f0=1v0+1u0⇒11.2=1v0+11.25∴v0=30cmm=v0u0⋅Dfe=301.25×253=200

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In a compound microscope the focal length of objective lens is 1.2 cm and focal length of eye piece is 3.0 cm. when object is kept at 1.25 cm in front of objective, final image is formed at infinity. Magnifying power of the compound microscope should be :