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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

20

B

15

C

30

D

50

Text Solution

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The correct Answer is:
B
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