A concave mirror of focal length 18 cm forms a real image with magnification magnitude 2. Find the object-image separation in centimetres.
Physics · Geometrical optics · spherical mirror
JEE Mains NEET

Question

A concave mirror of focal length 18 cm forms a real image with magnification magnitude 2. Find the object-image separation in centimetres.

G1 Physics · Accepted Answer

v=2u and f=uv/(u+v)=2u/3. Thus u=27 cm and v=54 cm. Separation=27 cm.