Ray Optics and Optical Instruments - Result Question 10
10. 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?
(a) $\mu=1.33$
(b) $\mu=1.40$
(c) $\mu=1.50$
(d) $\mu=1.25$
[2010]
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Answer:
Correct Answer: 10. (c)
Solution:
- (c) For total internal reflection,
$ \begin{aligned} & \mu \geq \frac{1}{\sin C} \geq \sqrt{2} \geq 1.414 \\ & \Rightarrow \mu=1.50 \end{aligned} $
