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At What distance should an object be placed from a convex lens of focal distance 20 cmso that its four times enlanged image may be obtained.05

Answer»

Here m = 4 m = v/u = 4 v = 4u By lens formula 1/v - 1/u = 1/f 1/4u - 1/u = 1/20 (1-4)/4u = 1/20 -3 / 4u = 1/ 20 u = -15 So object should be placed at a distance 15cm from lens



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