Question

In case of refraction of light through a rectangular glass slab, explain why (i) the emergent ray is

parallel to the direction of the incident ray (ii) the emergent ray is shifted sideward slightly?explain ​

Answer 1

Explanation:

As it is because when light Ray travels in a straight path and goes through a glass slab the Ray which is coming from a source of light bends because it comes from rarer medium to denser medium so it got bend

as for the second part the incident Ray firstly comes from a source of light through the rarer medium and goes to denser medium and again to rarer medium finally crossing through the glass slab is parallel to incident Ray which is directly coming from source of light without passing through denser medium

Answer 2

When the light ray incident on air-glass interface (DC) obliquely, it bends towards the normal.

The refracted ray is incident obliquely on the second parallel surface inside the rectangular glass slab, i. e. glass-air interface (AB) and after refraction, it moves away from the normal.

These refractions at both the surfaces obey the laws of refraction (Refer to basic building concept.)

For 2nd part toy need to tell the angle of incident is equal to the angle of emergent.

Hope it helps you☺️