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Question

For a telescope, the focal lengths of two lenses are 30 cm and 10 cm. One acts as objective and the other as eye-piece. The length of the telescope is
  1. 40 cm
  2. 3 cm
  3. 200 cm
  4. 30 cm

A
40 cm
B
3 cm
C
30 cm
D
200 cm
Solution
Verified by Toppr

focal length of objective lens

fo=30cm

focal length of eyepiece lens

fe=10cm

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