On the basis of their experiment to trace the path of a ray of light passing through a rectangular glass slab four students arrived at the following interpretation:

Question

$\begin{array}{1 1} (a)\; \text{angle of incidence is greater than the angle of emergence } \\ (b)\; \text{angle of emergence is less than the angle of refraction} \\ (c)\; \text{emergent ray is parallel to the incident ray} \\ (d)\; \text{emergent ray is parallel to the refracted ray} \end{array}$