Question

An object of height 4 cm placed at 20 cm before the concave mirror of focal length 15cm.
Find the magnification​

Answer 1

Answer:

height of object, h = 4 cm.

object distance, u = 20cm.

focal length, f = 15cm.

first find image distance, v = ?

by mirror formula,

1/f = 1/v + 1/u

then, find magnification,

m = h'/h = -v/u