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Q.

A compound microscope has two convex lens system with focal lengths 2cm and 5cm. An object is 2.5cm away from the objective lens. The tube length of microscope when magnification is maximum is equal to

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a

18.2 cm

b

14.2 cm

c

8.2 cm

d

4.2 cm

answer is B.

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Detailed Solution

Length of the tube  =V0+Ue1V0+1U0=1f0, 12.5+1V0=12, f0=2cm, Ve=−D1Ue−125=15, Ue=256=4.16
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A compound microscope has two convex lens system with focal lengths 2cm and 5cm. An object is 2.5cm away from the objective lens. The tube length of microscope when magnification is maximum is equal to