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

Answer:

The opposite faces of a glass slab are parallel. As a result, the angle of refraction at the first interface becomes the angle of incidence at the second, ∠r1 = ∠r2. The emerging ray bends in such a way that ∠i = ∠e. According to the principle of reversibility. As a result, the emerging and incidence rays are parallel.

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

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