The speed of light in media ' A ' and ' B ' are 2.0 × 10^10 cm / s and 1.5 × 10^10 cm / s respectively. A ray of light enters from the medium B to A…

The speed of light in media ' $\displaystyle A$ ' and ' $\displaystyle B$ ' are $\displaystyle 2.0 \times 10^{10} \mathrm{~cm} / \mathrm{s}$ and $\displaystyle 1.5 \times 10^{10}$ $\displaystyle \mathrm{cm} / \mathrm{s}$ respectively. A ray of light enters from the medium $\displaystyle B$ to $\displaystyle A$ at an incident angle ' $\displaystyle \theta$ '. If the ray suffers total internal reflection, then