Ray Optics and Optical Instruments - Result Question 10

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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?

======= ####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?

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/ray-optics-and-optical-instruments/ray-optics-and-optical-instruments—result-question-10.md (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:

  1. (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} $