Question

an object is placed at a distance of 40 cm in front of a concave mirror of focal length 15 CM calculate the magnification of the mirror​

Answer 1

1|f=1|v+1|u

1/v=1|f-1|u

1/v=1/15-1/40

1/v=8/120-3/120

1/v=5/120

1/v=1/24

therefore v=24