First slide

Spherical/Curved mirrors

Question

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

Moderate

A

75 cm
B

72 cm
C

63 cm
D

50 cm

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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