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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 eyepiece is `20cm`. The focal lengths of lenses are

A

18 cm, 2 cm

B

11 cm, 9 cm

C

10 cm, 10 cm

D

15 cm, 5 cm

Text Solution

Verified by Experts

The correct Answer is:
A
`L=f_(0)+f_(e )=20cm " and " M=(f_(0))/(f_(e ))=9`
On solving, `f_(0)=18 cm f_(e )=2 cm`
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