Question

what is the laws of refraction

Answer 1

Refraction is due to change in the speed of light as it enters from one transparent medium to another.Experiments show that refraction of light occurs according to certain laws.So Laws of refraction of light are 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.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.If i is the angle of incidence and r is the angle of refraction then \( \frac{\sin i} {\sin r} = constant = n \)               
This constant value is called the refractive index of the second medium with respect to the first.

Answer 2

Laws of Refraction:
1) The incident ray, refracted ray and normal to the interface of given two transparent media, all lie in same plane.
2) The ratio of sine of angle of incidence and sine of angle of refraction is always constant for the light of given colour and for the pair of given media.
The Second Law of Refraction is also known as Snell’s Law of Refraction.

[EQUATION IS GIVEN ABOVE]

The constant is called refractive index of the second medium in relation to the first medium.