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. If a parallel beam of light falling on A and B as a parallel beam, then d is equal to ……cm

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Image by lens A should be formed at focus of lens B.
`d+5=20impliesd=15cm`

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