A burning candle whose flame is 1.5 cm tall is placed at a certain distance in front of a convex lens. An image of candle flame is received on a white screen kept behind the lens. The image of flame also measures 1.5 cm. If f is the focal length of convex lens, the candle is placed : (a) at f (b) between f and 2f (c) at 2f (d) beyond 2f

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Solution

(c) at 2f because this is where the image of same size as the object and is inverted.

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