Physics - Geometrical Optics Question with Solution | TestHub

A plane wavefront ${\mathrm{A}}_1{\mathrm{B}}_1$ is incident at a boundary ${\mathrm{A}}_1{\mathrm{B}}_2$ as shown. It takes time t for the wavefront to travel from ${\mathrm{B}}_1$ to ${\mathrm{B}}_2$. Speeds of propagation of light in medium 1 and 2 are ${\mathrm{v}}_1$ & ${\mathrm{v}}_2$ respectively and ${\mathrm{v}}_2>{\mathrm{v}}_1$. For the total internal reflection of wavefront :-