In order to obtain a magnification of, -1.5 with a concave mirror of focal length 20 cm, the object will have to be placed at a distance :
m = -1.5 = v/u
such that v = -1.5u

f = -20 cm

using mirror formula, find u

Question

In order to obtain a magnification of, -1.5 with a concave mirror of focal length 20 cm, the object will have to be placed at a distance :

Philoid · Accepted Answer

m = -1.5 = v/u

such that v = -1.5u

f = -20 cm

using mirror formula, find u