Question

what is refraction and refractive index​

Answer 1

Answer:

Refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium.

Refractive index of one medium with respect which given by the ratio of sin of angle of incidence to the sin of angle of refraction.

Answer 2

In optics,the refractive index of a meterial is a dimensionless number that describe how fast light travels through the material.It is define as where c is the speed of light in vacuum and v is the phase velocity of light in the medium

Step-by-step explanation:

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