State the laws of refraction of light. Explain the term 'absolute refractive index of a medium' and write an expression to relate it with the speed of light in vacuum
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➲ First Law of Refraction
The incident ray, refracted ray and normal to the interface at the point of incidence lie in the same plane.
➲ Second Law of Refraction
The sine of angle of incidence bears a constant ratio with sine of angle of refraction for a given pair of media.
sin i / sin r = constant
➲ Absolute refractive index of a medium
Absolute Refractive Index of a medium = Speed of light in air or vacuum / Speed of light in the medium
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