Question

A concave mirror of focal length 25 cm forms 1.5 times real image of an object. Find the position of object and image.​

Answer 1

Explanation:

In concave mirror,

1/f =1/u + 1/v

If mirror is concave and image is real, Then it is on same side of mirror. And below the principal axis.

So, m=v/u

1.5u= v

So, 1/25=1/u+1/1.5u

1/25= (1.5+1)/1.5u

1/25=2.5/1.5u

1/25=5/3u

u= (25×5)/3

u= 125/3cm

So., v= 1.5× 125/3

v= 187.5/3cm