If a convex lens of focal length 20 cm a...

If a convex lens of focal length 20 cm and a concave lens of focal length 30 cm are kept in contact with each other (i) what will be the focal length of the combination ? (ii) what will be the power of the combination ? (iii) what will be behaviour of the combination ?

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(i) f=60 cm (ii) ` P = 5/3 D = 1.6667` D (approximately)

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