Question

An object 20 cm from a spherical mirror gives rise to a virtual image 15 cm behind the mirror. Determine the magnification of the image and the type of mirror used.

Answer 1

Given
u=-20

v =15
then m= $\frac{-v}{u}$
m= $\frac{-15}{-20}$

m = $\frac{3}{4}$
$\to$ m= 0.75

Convex mirror are used