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Q.

If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25 cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is

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a

150

b

400

c

200

d

250

answer is B.

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Detailed Solution

detailed_solution_thumbnail

1f0=1v0+1u0⇒11.2=1v0+11.25

∴v0=30 cm

m=v0u0.Dfe=301.25 x 253=200

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