Question

When the incident ray strikes the reflecting surface normally, then,

$\angle \mathrm{i}=\angle \mathrm{r}=$_____?

Answer 1

1. According to the laws of reflection, the angle of incidence is equal to the angle of reflection, that is, $\angle \mathrm{i}=\angle \mathrm{r}$
2. When a light ray incident is normally on the surface of an object, after reflection it retraces the path in the backward direction.
3. In this case, $\angle \mathrm{i}=\angle \mathrm{r}=0^0$

Thus, When the incident ray strikes the reflecting surface normally, $\angle \mathrm{i}=\angle \mathrm{r}=$${\mathbf{0}}^{\mathbf{0}}$.