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The focal length of a concave mirror is 50 cm. Where an object be placed so that its image is two times and inverted

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75 cm

72 cm

63 cm

50 cm

answer is A.

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Detailed Solution

For real image m = – 2, so by using $m = \frac{f}{f - u}$

$\Rightarrow - 2 = \frac{- 50}{- 50 - u} \Rightarrow u = - 75 cm$

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