Question

Show that incident ray and emergent ray are parallel when light is obliquely on a rectangular glass slab

Answer 1

In the following figure, a light ray travelling in air is incident on the rectangular glass slab. ... We see that the incident and emergent rays are parallel to each other. These rays are parallel because the extent of bending on the opposite and parallel faces of slab is equal and opposite.

Answer 2

Question :

Show that incident ray and emergent ray are parallel when light is obliquely on a rectangular glass slab .

Answer :

• In the attached figure, a light ray travelling in air is incident on the rectangular glass slab.
• It gets refracted and bends towards the normal .
• Again,a change in direction takes place when the refracted ray traveling in glass emerges into air .
• Here , the light ray bends away from the normal .
• We see that the incident and emergent rays are parallel to each other.
• These rays are parallel because the extent of bending on the opposite and parallel faces of slab is equal and opposite.

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