Question

A convex mirror produces 3 times enlarged image of an object placed at 10cm in front of it calculate the focal length of the mirror

Answer 1

Answer:

Focal length is 0.07m or 3/40 m

Explanation:

Magnification,m = 3

Object - distance, u = -10cm=-0.1 m

Let the image of object be v m

m = - v/u

3 = v/0.1

v = 0.3 m

1/v+1/u=1/f [here f is focal length]

1\0.3+1/0.1=1/f

1/f =40/3

f = 0.07 m