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From the course of a ray of light throug...

From the course of a ray of light through a rectangular glass slab, explain what is lateral displacement and net deviation?

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The course of a ray of light through a rectangular glass slab. We find that emergent ray RS is parallel to incident ray PQ. Therefore, net deviation on two refractions through a rectangular glass slab is zero. However, the emergent ray RS is displaced from incident ray PQ by a distance RN. This represents lateral displacement of the ray `PQ` on passing through the prism.
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PRADEEP-REFLECTION AND REFRACTION-Short Q/A
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