A ray is incident on a refracting surface of RI $$\mu$$ at an angle of incidence $$i$$ and the corresponding angle of refraction is $$r$$. The deviation of the ray after refraction is given by $$\delta = i - r$$. Then, one may conclude that

A

$$r$$ increases with $$i$$

B

$$\delta$$ increases with $$i$$

C

$$\delta$$ decreases with $$i$$

D

the maximum value of $$\delta$$ is $$\cos^{-1}\left(\frac{1}{\mu}\right)$$