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The magnifying power of a telescope is 9...

The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and the eyepiece is found to be 20 cm. The focal length of lenses are :

A

18 cm, 2 cm

B

11 cm, 9 cm

C

10 cm, 10 cm

D

15 cm, 5 cm.

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