Using a well-labelled ray diagram and suitable geometrical reasoning
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
Using a well-labelled ray diagram and suitable geometrical reasoning, explain why the focal length of a spherical mirror is numerically equal to half of its radius of curvature. Your answer should also state how the signs of the focal length and radius of curvature differ for concave and convex mirrors under the Cartesian sign convention.