First slide

Spherical/Curved mirrors

Question

A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36cm. The distance of the object from the mirror is

Moderate

A

5 cm
B

12 cm
C

10 cm
D

20 cm

Solution

$Image is virtual so m = + 3 . and f = \frac{R}{2} = 18 cm$
$So from m = \frac{f}{f - u} \Rightarrow 3 = \frac{(- 18)}{(- 18) - u} \Rightarrow u = - 12 cm .$

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