A convex lens throws a 8m magnified image of the object on a screen from the lens. If the magnification is 5, find the focal length of the lens.
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THE ans is 8.57
v=-12cm mag =15 u= -12/15 = -0.8
1/f= 1/v -1/u
=1/0.8-1/12
f= 8.57
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