Question

An object of height 1.2 cm is placed before a concave mirror of focal length 20 cm so that a real image is formed at a distance of 60 cm from it. Find the position of an object. What will be the height of the image formed ?

Answer 1

Here, object height, h = 1.2 cm, 

Focal lenght, f = -20cm, 

Image distance, v = – 60 cm 

Object distance, u = ? Height of image, h′ = ? 

Applying the mirror formula