Rankers Physics

Refraction by Plane Surfaces: Practice Problem & Solution

A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from: (2004)
Two points propagating in two different parallel directions
One point propagating in two different directions through slab
One point propagating in the same direction through slab
Two points propagating in two different non parallel directions

Solution Explained:

To solve this problem, we apply the core principles of Refraction by Plane Surfaces. Understanding the underlying formula is key to arriving at the correct answer below:

When composite light is incident obliquely on a parallel-sided glass slab, different colors undergo different refraction angles due to dispersion.
They suffer different lateral shifts but emerge parallel to the incident ray direction.
Thus, red and green rays emerge from two points propagating in two different parallel directions.

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