Question

An object is placed on the principal axis of a convex mirror of focal length 15 cm. If the distance of the object from the mirror is 30 cm, determine the image distance

• A. 15 cm
• B. 20 cm
• C. 10 cm
• D. 30 cm

Answer 1

The correct option is C 10 cm

Given: $u=-30cm$
$f=15cm$
solution:from mirror equation
$\frac{1}{v}+\frac{1}{u}=\frac{1}{f}$
$\frac{1}{v}-\frac{1}{30}=\frac{1}{15}$
$\frac{1}{v}=\frac{3}{30}$
$v=10cm$