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A beam of light composed of red and green rays is incident obliquely at a point on the face of rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from

1. one point propagating in the same direction
2. two points propagating in two different non-parallel directions
3. two points propagating in two different parallel directions
4. one point propagating in two different directions

Correct answer: two points propagating in two different parallel directions

Solution

When light passes through a rectangular glass slab, the emergent rays are parallel to the incident rays due to the parallel nature of the slab's faces. However, red and green rays have different refractive indices, causing them to emerge from slightly different points but in parallel directions.

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