Question

Determine the image distance when the focal length of a convex mirror is 12 cm and the object distance is 24 cm?

• A. 6 cm
• B. 12 cm
• C. 24 cm
• D. 8 cm

Answer 1

The correct option is C 24 cm

Given:
Focal length, $f=-12cm$
The object distance, $u=-24cm$

Using lens formula,
$\frac{1}{v}+\frac{1}{u}=\frac{1}{f}$
$\frac{1}{v}+\frac{1}{-24}=\frac{1}{-12}$
$v=-24cm$