Question

State the law of refraction of light. Explain the term 'absoulte refractive index of a medium' and write an expression to realte it with the speed of light in vacuum

Answer 1

here your answer
Laws of Refraction

(i) The incident ray, the refracted ray and the normal to the transparent surface at the point of incidence all lie in the same plane.

(ii) The ratio of the sine of the angle of incidence in the first medium to the sine of the angle of refraction in the second medium is a constant for a given pair of medium and for a given wavelength of light.

n=sin i / sin r

Absolute refractive index of a medium is defined as the ratio of the speed of light in vacuum or air to the speed of light in the medium. It is denoted by n.

n=speed of light in air (c) / speed of light in medium (v)

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