Question

A point light source is placed in front of a convex mirror at a distance of 40 cm. The focal length of the mirror is 40 cm. Find the position of the image.

Answer 1

f = -40 cm

u = -40 cm

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

$\frac{1}{-40}$ = $\frac{1}{-40}$ + $\frac{1}{v}$

$\frac{1}{v}$ = 0

v = infinity

The image is formed at Infinity