CBSE Class 10 Science 2017 · Paper 31/2/1 · Question 4

The mirror is concave (its hatching, on the right, marks the back). Draw the reflected ray from the point where the incident ray meets the mirror through the principal focus F, and continue it beyond F. Join the point of incidence to C: this radius is the normal to the mirror there. The angle of incidence $\angle i$ is the angle between the incident ray and the normal, and the angle of reflection $\angle r$ is the angle between the normal and the reflected ray, with $\angle i=\angle r$.