Physics, 19.12.2020 14:50 penny3109

if a convex lens of focal length 20cm and a concave lens of focal length 30cm kept in contact with each other first what will be the focal length of the combination second what will be the power of the combination third what will be the behaviour of the combination

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if a convex lens of focal length 20cm and a concave lens of focal length 30cm kept in contact with e...