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Define angle of incidence and angle of emergence in an experiment to trace the poth of light pothrough a rectangular glass slab. How are these two angles related to each othe |
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Answer» It depends on what object the light is incident on.In case of a glass slab, the incident ray is parallel to the emergent ray, that means the angle of incidence is equal to the angle of emergence. The explanation is as follows: When a ray of light is incident on the surface of the glass slab, it undergoes refraction. As the refractive index of the glass slab is denser than that of air, the ray of light bends towards the normal. The same ray of light which is refracted acts as the ray of incidence on the inner surface of the glass slab. it undergoes refraction again and the the ration of the refractive indices between air and glass is same, the emergent ray is parallel to the incident ray. Hence the angles are equal. |
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