Question

i) State and explain laws of refraction.
ii) Define refractive index and write its S.I unit and dimensional formula.​

Answer 1

Answer:

1. Laws of refraction state that: The incident ray, reflected ray and the normal, to the interface of any two given mediums, all lie in the same plane. The ratio of the sine of the angle of incidence and sine of the angle of refraction is constant. This is also known as Snell's law of refraction.
2. Refractive index is the ratio of the speed of light in vacuum to the speed of light in the given medium and it is denoted by $'\mu '$. ... Unit of refractive index ($\mu $) will be the ratio of the unit of speed of light in vacuum(c) to the speed of light in the given medium(v).

Answer 2

Explanation:

(i)1. The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.

2. The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given color and for the given pair of media. This law is also known as Snell’s law of refraction.

(ii)in optics, the refractive index or index of refraction of a material is a dimensionless number that describes how light propagates through that medium. The index of refraction does not have units. It is the ratio of the speed of light in various mediums so the unit cancel out. it is mediums so the unit cancleout.it is unitless