Question

An Object is kept at a distance of 4 m in front of a spherical mirror which forms its erect image at a distance of 1.0 m from the mirror. What is its magnification? Is the mirror concave or convex?

Answer 1

given:
u=4m
v=1m
m=-v/u
by sign convention, u=-4m
∴m=1/4
=0.2
as the magnification is positive and vitual and diminished hence the mirror could be convex .

Answer 2

U = -4cm

V = 1 cm

m = ?

According to formula ,

m = -v/u

So, m = -1/-4

m = 0.25