State the laws of refraction of light. Explain the term absolute refra

1.	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.
Answer» Laws of refraction of light: (a) The incident ray, the normal and the refracted ray at the point of incidence all lies in the same plane for the two given transparent medium. (b) The ratio of sine of angle of incidence (i.e., sin i) to the sine of angle of refraction (i.e., sin r) is always constant for the light of given colour and for the given pair of media. Mathematically, sin i/ sin r = constant = n₂ The constant ‘n’ is called refractive index of the second medium with respect to the first medium. Absolute refractive index of the medium is given by, n = Speed of light in a vacuum (c) / Speed of light in medium (v)

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.

Answer»

Laws of refraction of light:

(a) The incident ray, the normal and the refracted ray at the point of incidence all lies in the same plane for the two given transparent medium.

(b) The ratio of sine of angle of incidence (i.e., sin i) to the sine of angle of refraction (i.e., sin r) is always constant for the light of given colour and for the given pair of media.

Mathematically, sin i/ sin r = constant = n₂

The constant ‘n’ is called refractive index of the second medium with respect to the first medium. Absolute refractive index of the medium is given by,

n = Speed of light in a vacuum (c) / Speed of light in medium (v)

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