3 A convex lens A of focal length 20 cm and a concave lens B...
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Physics
3 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 1 2 3 4 50 30 15
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