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A convex lens A of focal length 20cm an...

A convex lens A of focal length 20cm and a concave lens G of focal length 5cm are kept along the same axis with the distance d between them. If a parallel beam of light falling on A leaves B as a parallel beam, then distance d in cm will be

A

25

B

15

C

30

D

50

Text Solution

Verified by Experts

The correct Answer is:
B
From figure it is clear that separation between lenses `d=20-5=15cm`
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