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

A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance `d` between them. What is the value of `d` if a parallel beam of light incident on A leaves B as a parallel beam ?

A

15 cm

B

20 cm

C

30 cm

D

5 cm.

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