Question

Describe giving reasons the path of ray of light incident on a glass slab takes till it emerges from the Slab ?​

Answer 1

When a light ray incident on glass slab at any angle other than normal then it passes from air to glass. As light ray travels from rarer medium to denser medium it bends towards the normal. Inside glass slab refracted light ray travel straight path.
Again at the boundary of glass slab, when light ray travels from glass to water that is from denser to rarer medium, light ray bends away from normal and travel as emergent ray.