A ray of light travelling in a transparent medium of refractive index $\mu$ falls, on a surface separating the medium from air at an angle of incidence of $45^{\circ}$. For which of the following value of $\mu$ the ray can undergo total internal reflection?

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Aicharya · Accepted Answer

For total internal reflection $\begin{aligned} & \mathrm{i} > \mathrm{c} \ \Rightarrow & \sin \mathrm{i} > \sin \mathrm{c} \ \Rightarrow & \sin 45^{\circ} > \frac{1}{\mu} \ \Rightarrow & \mu > \sqrt{2} \ \Rightarrow & \mu > 1.4 \end{aligned}$

A ray of light travelling in a transparent medium of refractive index $\mu$ falls, on a surface separating…

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