Question

3. The focal length of a concave mirror is
15 cm. If the object distance is 60 cm, find the
image distance.
(Ans. v= – 20 cm)​

Answer 1

Explanation:

From mirror formula

1/f = 1/v +1/u

here

f = -15 cm

u = - 60 cm

therefore

-(1/15)=1/v+(-(1/60))

solving we get v= -20 cm