Question: Q. 4. A ray of light is incident on a medium with angle of incidence ’
R [CBSE SQP 2018-19]
$$ \begin{aligned} & \text {
Solution:
Ans. From the graph, } \tan \theta=\frac{\sin r}{\sin i} \quad 1 / 2 \
&
[CBSE Marking Scheme 2018]
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