Question

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. If a parallel beam of light falling on A leaves B as a parallel beam, then the distance d in cm will be​

Answer 1

Answer:

option b

Explanation:

distance between is 20−5=15

as image formed by lens must be at the focus of the second lens to get final image at infinity.

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Answer 2

Answer:

option b  

Explanation:

distance between is 20−5=15

as the image formed by the lens must be at the focus of the second lens to get a final image at infinity.

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IF IT HELPS THEN PLZ MARK AS BRILLIANT

THANK YOU