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An object is placed 40cm in front of a concave lens of focal length 20cm; determine the position of the image.

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1/-f 1/V + 1/U
-1/20 = 1/V + 1/U
1/V = 1/20 - 1/40 = -2-1/40 = 3/40
V= -40/3 = 13.3cm

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