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Most materials have the refractive index, n lt 1. So, when a light ray from air enters a naturally occuring material, then by Snell's law, (sin theta_(1))/(sin theta_(2)) = (n_(2))/(n_(1)), it is understood that the refracted ray bends towards the normal. But it never emerges on the same side of the normal as the incident ray. According to electromagnetism, the refractive index of the medium is given by the relation, n=((c)/(V))=pmsqrt(epsilon_(r)u_(r)), where c is the speed of electromagnetic waves is vacuum, v its speed in the medium , epsilon_(r) and mu_(r) are relative permittivity and permeability of the medium respectively. |
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Answer»
`sin theta_(2) = (n_(1))/(n_(2)) sin theta_(1)` `rArr n_(2) "is - ve". THEREFORE theta_(2) is - ve.` |
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