In case of both, convex mirror and concave mirror, any line passing through centre of curvature of the mirror is normal to the mirror. A ray of light falling normally on the mirror, retraces its path on reflection. This is because for a normaly ray, angle of incidence, `anglei=0^@`. As angle of reflection is equal to angle of incidence, i.e., `angle r=angle i` , therefore, `angle r=0^@`. That is why the path of the ray normally on the mirror is retraced.
Read the above passage and answer the following questions :
(i) Do the rays passing through principal focus of mirror fall normally on the mirror. (ii) Which is closer to the mirror, principal focus or centre of curvature of the mirror ? (iii) What values of life do you learn from this concept?