Question

A concave mirror forms an image at a distance of 45cm from the pole of the mirror.Its magnifications
three times. Then find its object distance.​

Answer 1

let image distance v= 45

and it's magnification m = 3

object distance u =?

we know that magnification m = - v /u

3 = -(45) /u

u = -45/3

u= -15

Therefore, the object distance is -15.