Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself ? Explain using a diagram.

A ray of light travelling in air is incident on a rectangular glass slab. What will happen?

When a light ray emerges out after refraction at a rectangular glass slab, it is parallel to the incident ray. Why ?

When rays of light are incident on a glass slab, then the incident ray and emergent ray are ____ to each other.

A ray of white light passes through a rectangular glass slab, entering and emerging at parallel faces. The angle of incidence measured from the normal to the glass surface, is large. Then

A ray of light incident on glass slab finally emerges out of it. The ray which emerges out is called :

When a ray of light travelling in air enters obliquely into a glass slab, it is observed that the light ray emerges parallel to the incident ray but it is shifted sideways slightly. Draw a labelled ray diagram to illustrate it.