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A convex lens A of focal length 4 m and a concave lens B of focal length 1 m 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 d in m is equal to:

Answer» A convex lens A of focal length 4 m and a concave lens B of focal length 1 m 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 d in m is equal to:




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