A ray of monochromatic light is incident on the plane surface of separation between two media $\mathrm{x}$ and $\mathrm{y}$ with angle of incidence $\mathrm{i}$ in the medium $\mathrm{x}$ and angle of refraction $\mathrm{r}$ in the medium $\mathrm{y}$ . The graph shows the relation between sin $\mathrm{i}$ and sin $\mathrm{r}$

Total internal reflection can take place when the incidence is in $\mathrm{x}$

The speed of light in the medium $\mathrm{y}$ is $\sqrt{3}$ times than in medium $\mathrm{x}$

Total internal reflection can take place when the incidence is in $\mathrm{y}$

The speed of light in the medium $\mathrm{y}$ is 1/$\sqrt{3}$ times than in medium $\mathrm{x}$