Following are graphs of angle of deviation versus angle of incidence.

Based on the above graphs mark the correct options.

Light travels from rarer to denser medium

$$\begin{gathered} \delta =i-r \\ \delta =i-{\sin }^{-1}\frac{\left(\sin i\right)}{\mu } \end{gathered}$$

non-linear increasing function of $i$.

Slope of tangent: $\frac{d\delta }{di}=1-\frac{\cos i}{\sqrt{{\mu }^2-{\sin }^{2}i}}$

Slope of tangent decreases as $i$ increases.

Hence 'c' is the graph for light that travels from rarer to denser medium.

For light that travels from denser to rarer medium ,$$\begin{gathered} \delta = r-i ={\sin }^{-1}(\mu \sin i)-i \\ \frac{d^2\delta }{d{i}^2}=\frac{\mu ({\mu }^2-1) \sin i}{{(1-{\mu }^2{\sin }^{2}i)}^{{\displaystyle \frac{3}{2}}}}>0 . So option \left(1\right) is right . \end{gathered}$$