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The focal lengths of the objective and e...

The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm . The maximum magnifying power of the telescope will be

A

`-100`

B

`-60`

C

`-48`

D

`-40`

Text Solution

Verified by Experts

The correct Answer is:
C
Magnifying power , `M=f_0/(f_e) (1+ (f_e)/d)`
Least distance of distinct vision , d= 25 cm
`M=-200/5 (1+5/25) =-40 (1+1/5)`
`=-40 (6/5)` =-48 cm .
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