Question

An object is placed at a distance of 12 cm in front of a concave mirror. It forms a real image four times larger than the object. Calculate the distance of image from the mirror?
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Answer 1

$\huge \sf \red{Solution.}$

Given, object distance, u = –12 cm

Magnification, m = –4

∵ It is known that,

$m = \frac{ - v}{u}$

Therefore, we have

$- 4 = \frac{ - v}{ - 12}$

$v = - 48 \: cm$

Answer 2

$\huge \sf \red{Solution.}$

Given, object distance, u = –12 cm

Magnification, m = –4

∵ It is known that,

$m = \frac{ - v}{u}$

Therefore, we have

$- 4 = \frac{ - v}{ - 12}$

$v = - 48 \: cm$