A concave mirror forms a real image with |m|=3. The object is moved until |m|=1. If |f|=20 cm, the object displacement is:
Options

Question

A concave mirror forms a real image with |m|=3. The object is moved until |m|=1. If |f|=20 cm, the object displacement is:

G1 Physics · Accepted Answer

For M=3, u=4f/3=26.667 cm. For M=1, u=2f=40 cm. Displacement=13.333 cm.