In order to obtain a magnification of, - 3 (minus 3) with a convex lens, the object should be placed : (a) between optical centre and F (b) between F and 2F (c) at 2F (d) beyond 2F

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Solution

The minus sign implies image is real and inverted. Also the magnitude of magnification is greater than 1. So, it is a magnified image. These both condition are satisfied when placed between F and 2F. So, the correct choice is (b).

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