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Ther is a telescope of magnifying power ...

Ther is a telescope of magnifying power 5 and tube length 60 cm. What is the focal length of its eye piece?

A

30cm

B

10cm

C

40cm

D

20cm

Text Solution

Verified by Experts

The correct Answer is:
B
`m=(f_(0))/(f_(e))`
`5=(f_(0))/(f_(e))`
`f_(0)=5f_(e)`
`f_(0)+f_(e)=60`
`6f_(e)=60`
`f_(e)=10`
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