Q.

The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is

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a

200 cm

b

160 cm

c

2.5 cm

d

0.1 cm

answer is C.

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Detailed Solution

If nothing is said then it is considered that final image is formed at infinite and m=LDfofe⇒400=20×250.5×fe⇒fe=2.5cm
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The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is