Question

what is refraction? and law of refraction?​

Answer 1

The principle that for a ray, radar pulse, or the like, that is incident on the interface of two media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocity of the ray in the first medium to the velocity in the second medium and the incident ray.

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Answer 2

Refraction :-

❒ The phenomenon of change in the path of light as it travels from one medium to another is called refraction.

Laws of Refraction :-

❒ The incident ray , the refracted ray and the normal to the refracting surface at the  point of incidence .

Also , ratio of sine of the angle of incidence to the sine of the angle of refraction is constant , for the light of a given color  and for the given pair of media .

$\sf \bigstar \; \dfrac{sin\;i}{sin\;r}$ =  ₁μ₂  

( It is also known as Snell's law of refraction )

Where , ₁μ₂ is the refractive index of second medium in respect of first medium . If ₁μ₂ is greater than 1 then the light ray bends towards normal and if ₁μ₂ is less than 1 , then light ray bends away from normal

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