Question:
a light ray is incident normally on one of the refracting faces of a prism and just emerges out grazing the second surface . then, the relation between angle of prism and its critical angle isis?
Answer:
For grazing emergence from prism,
angle of emergence = 90°, the emergent ray grazes along the prism surface. This happens when the light ray strikes the second face of the prism at the critical angle for glass - air.
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