The incident ray, reflected ray and the normal at the point of incidence, all lie in the same plane.
At the point of incidence, angle of incidence is equal to angle of reflection/$\angle\text{i} = \angle\text{r}$.
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The refractive index of water with respect to vacuum is $\frac{4}{3}$ and refractive index of vacuum with respect to glass is $\frac{2}{3}$ If the speed the speed of light in glass is $2 \times 10^8 ms^{-1}$, find the speed of light in (i) vacuum, (ii) water.
Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it.