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The optical length of an astronomical te...

The optical length of an astronomical telescope with magnifying power of ten for normal vision is `44 cm`. What is the focal length of the objective ?

A

4 cm

B

40 cm

C

44 cm

D

440 cm

Text Solution

Verified by Experts

The correct Answer is:
B
`f_(O)/f=10andf_(o)+f_(E)=44" "thereforef_(o)=40cm`
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