Explain failure of snell's law ?
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Reasons of failure of Snell's law:-
At the point of total internal reflection.“Snell's law is generally true only for isotropic or specular media (such as glass). In anisotropic media such as some crystals, birefringence may split the refracted ray into two rays, the ordinary or o-ray which follows Snell's law, and the other extraordinary or e-ray which may not be co-planar with the incident ray”. If the incident ray is polarised with its electric field vector perpendicular to the plane of incidence, no refraction takes place. I think this is also a situation where Snell’s Law fails.If the Snell’s Law is stated as n1sini=n2sinrn1sini=n2sinr, then it holds good at even normal incidence. According to this, if angle of incidence is zero then angle of refraction is also zero and the result is independent of the refractive index. However if the law is used to find refractive index, it fails at this point.
At the point of total internal reflection.“Snell's law is generally true only for isotropic or specular media (such as glass). In anisotropic media such as some crystals, birefringence may split the refracted ray into two rays, the ordinary or o-ray which follows Snell's law, and the other extraordinary or e-ray which may not be co-planar with the incident ray”. If the incident ray is polarised with its electric field vector perpendicular to the plane of incidence, no refraction takes place. I think this is also a situation where Snell’s Law fails.If the Snell’s Law is stated as n1sini=n2sinrn1sini=n2sinr, then it holds good at even normal incidence. According to this, if angle of incidence is zero then angle of refraction is also zero and the result is independent of the refractive index. However if the law is used to find refractive index, it fails at this point.
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