Question

An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm, the position of the image is:

• A. 12 cm in front of the mirror
• B. 12 cm behind the mirror
• C. 6 cm behind the mirror
• D. 6 cm in front of the mirror

Answer 1

The correct option is C 6 cm behind the mirror

$u=-4cmf=-12cm$

Mirror formula:
$\frac{1}{f}$ = $\frac{1}{v}$ + $\frac{1}{u}$

$\frac{1}{v}$ = $\frac{1}{f}$ – $\frac{1}{u}$

$\frac{1}{v}$ = $\frac{1}{-12}$ + $\frac{1}{4}$

v = 6 cm.

The image is 6 cm from the pole behind the mirror.