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application of the total internal reflection in diamond ,optic fiber and mirage and other articles​

Answer 1

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Total Internal Reflection: Diamonds & Fiber Optics

When light passes from one medium into a second, less dense medium, the light bends away from the normal. At a particular incident angle, the angle of refraction will be 90 degrees, and the refracted ray would travel along the boundary between the two media.

The incident angle at which this occurs is called the critical angle. This angle can be calculated by using Snell's Law:

sin(criticle angle) = (n2/n1)(sin 90 degrees) = (n2/n1)

Where n1 = index of refraction in 1st medium

n2 = index of refraction in 2nd medium.

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