Two halves of a concave mirror of focal length 30 cm are rotated by +1° and −1°. Using tan2°=0.0349, find the image separation in centimetres.
Physics · Geometrical optics · spherical mirror
JEE Mains NEET

Question

Two halves of a concave mirror of focal length 30 cm are rotated by +1° and −1°. Using tan2°=0.0349, find the image separation in centimetres.

G1 Physics · Accepted Answer

Each image shifts by 30 tan2°≈1.047 cm to opposite sides, so total separation≈2.094 cm.