## Physics - Refraction of Light

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Refraction is the of light as it passes from one medium to another medium of a different . When light travels from one medium to an optically denser medium, it is refracted the normal.
There are laws of refraction:
Sin i/Sin r = , η where i = angle of incidence and r = angle of . η is known as the refractive .
The ray, refracted ray and normal are all in the same plane.
The refractive index, η = velocity of light in medium 1/ of light in medium 2.
Also, refractive index, η = real depth/ depth.
The refractive index of a medium is the ratio of the if the angle of incidence to the sine of the angle of refraction when light travels from a into that medium.
The refractive index between two media is the of the sine of the angle of incidence to the sine of the angle of refraction when light travels from one of the two media into the other.
η = sin 1/sin r is known as Law.
The angle, c is the angle of incidence in the denser medium corresponding to an angle of refraction of 90° in the less dense medium.
Total reflection occurs when the angle of incidence in the denser medium is greater than the critical angle. The light is reflected back into the medium.
Total internal reflection is used in prism , periscopes and fibre optics (communication and endoscopes).
An optic fibre is a thin transparent rod which allows light to travel through it by total internal reflection.