A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at

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15 cm behind the mirror

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answer is D.

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Detailed Solution

$u = - 30 cm, f = + 30 cm, by using mirror formula \frac{1}{f} = \frac{1}{v} + \frac{1}{u} \Rightarrow \frac{1}{+ 30} = \frac{1}{v} + \frac{1}{(- 30)} v = 15 cm, behind the mirror$

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