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Why does a light ray incident on a recta...

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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Due to variation in speed of light in different medium, light bends as it moves from one medium to another. Since, there are two surfaces for reaction which are parallel the light ray should bend in opposite sense in them equally, the emerging light ray is always parallel to the incident ray.
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