Question

When the light goes from an optically denser to an optically rarer medium, it always bends _____ the normal.

Answer 1

Light passes from a denser medium to a rarer medium:

When light passes from a denser medium to a rarer medium, it always bends away from the normal. This is in accordance with snell’s law.

Mathematically, snell's law can be represented as:

$\Rightarrow \frac{{\mathrm{n}}_2}{{\mathrm{n}}_1}=\frac{\sin \mathrm{i}}{\sin \mathrm{r}}$

Here,

${\mathrm{n}}_1$ and ${\mathrm{n}}_2$ is the refractive index.

$\sin \mathrm{i}$ is the angle of incidence.

$\sin \mathrm{r}$ is the angle of refraction.