(C) Emergent ray is parallel to the refracted ray.
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Refraction
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Emergent ray is the ray which emerges at the source of light. Emergent ray is parallel to the incident ray, after the refraction of Incident ray through a glass slab when the angle of incidence is equal to the angle of emergence, and they are also the alternate interior angles. This can happen in a rectangular glass slab, but not in a prism.
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