Question

The image of an object kept at a distance of 10cm from a concave mirror is 3 times larger. In each case (1) Virtual, (2) Real, find the focal length of concave mirror

Answer 1

Given,

m= -3

u= -10cm

v= ?

we know that,

m= -v/u

-3= -v/-10

-3× -10= -v

30= -v

therefore, v= -30 and the image is located at a distance of 30 cm in front of the mirror.