Rectangular glass slab | Prism |
1. The incident ray and emergent ray are parallel to one another. | 1. The incident ray and emergent ray are not parallel to one another. |
2. The angle of incidence is equal to the angle of emergence. | 2. The angle of incidence may or may not be equal to the angle of emergence. |
3. White light does not split as it emerges outward. | 3. White light splits into seven colours as it emerges outward. |