Question: Q. 4. A ray of light is incident on a medium with angle of incidence ’ $i$ ’ and is refracted into a second medium with angle of refraction ’ $r$ ‘. The graph of $\sin i$ versus $\sin r$ is as shown. Find the ratio of the velocity of light in the first medium to the velocity of light in the second medium.
R [CBSE SQP 2018-19]
$$ \begin{aligned} & \text {
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Solution:
Ans. From the graph, } \tan \theta=\frac{\sin r}{\sin i} \quad 1 / 2 \ & \begin{aligned} \frac{\sin i}{\sin r} & =\frac{v_{1}}{v_{2}} \ \frac{v_{1}}{v_{2}} & =\cot \theta \end{aligned} \end{aligned} $$
[CBSE Marking Scheme 2018]
