Physics - Geometrical Optics Question with Solution | TestHub

The speed of light in media ${\mathbf{M}}_1$ and ${\mathrm{M}}_2$ is $1.5\times 10^8\mathrm{m}/\mathrm{s}$ and $2.0\times 10^8\mathrm{m}/\mathrm{s}$ respectively. A ray of light enters from medium ${\mathrm{M}}_1$ to ${\mathrm{M}}_2$ at an incidence angle $i$. If the ray suffers total internal reflection, the value of $i$ is