First slide

Spherical/Curved mirrors

Question

Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is

Moderate

A

– 4 cm
B

8 cm
C

6 cm
D

12 cm

Solution

$m = \pm 3 and f = - 6 cm Now m = \frac{f}{f - u} \Rightarrow \pm 3 = \frac{- 6}{- 6 - u} For real image - 3 = \frac{- 6}{- 6 - u} \Rightarrow u = - 8 cm For virtual image 3 = \frac{- 6}{- 6 - u} \Rightarrow u = - 4 cm$

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