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The focal length of eyepiece of an astro...

The focal length of eyepiece of an astronomical telescope is 6 cm. What is the distance between the objective and the eyepiece if it produces a magnification of 10, for normal adjustment ?

A

36 cm

B

46 cm

C

56 cm

D

66 cm

Text Solution

Verified by Experts

The correct Answer is:
D
`f_(e)=6 cm`
For the normal adjustment of a telescope,
`M=(f_(o))/(f_(e))`
`therefore f_(o)=M xx f_(e)=10xx6=60`
`therefore ` The distance between the two lenses
`=f_(o)+f_(e)=60+6=66 cm`
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