Question

A 2 cm high object is placed at a distance of 32 cm from a concave mirror. The image is real, inverted and 3 cm in size. Find the focal length of the mirror and the position where the image is formed?

Answer 1

m=h2/h1
h1=-3
h2=+2
m=-3/2
m=-1.5
m=-v/u
m=-1.5
v=?
u=-32
-1.5=v/-32
v=-1.5×32
v=-48
1/f=1/+1/u
1/f=-1/48-1/32
1/f=-2-3/96
f=-19.2
hope its help you