Question

A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 40 cm from the mirror: How far is the object located from the mirror?​

Answer 1

Explanation:

since, the image formed by the concave mirror

therefore, image distance(v)=-40cm

and,magnification=-1

magnification=-v/u

-1 = -(-40)/u

-u= 40

u=-40

Hence,the object placed at the distance of 40cm from the mirror.