what is refraction define cases of refraction
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Answer:
Refraction is the bending of a light or sound wave, or the way the light bends when entering the eye to form an image on the retina. An example of refraction is a bending of the sun's rays as they enter raindrops, forming a rainbow.
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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 or index of refraction of a material is a dimensionless number that describes how fast light travels through the material. It is defined as. where c is the speed of light in vacuum and v is the phase velocity of light in the medium.
Total internal reflection when refraction reflection at critical angle and refraction takes place called TIR