What is Snell's Law?

Snell's law is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves, passing through a boundary between two different media, such as water and glass. The law says that the ratio of the sine of the angle of incidence and of refraction is a constant that depends on the media. So, light changes direction when it passes through different media (glass to air, air to water, etc.). Snell’s law is used to calculate the amount of refraction (deviation), or to tell you the refractive index of the materials. Snell's law states that the ratio of the sine of the angle of incidence and refraction is equivalent to the ratio of velocities in the two media, or equivalent to the opposite ratio of the indices of refraction.

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For a given pair of media, the ratio between the sine of the angle of incidence and the sine of the angle of refraction is a constant which is known as the refractive index of the second medium with respect to the first medium. This is the Snell's Law.

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Snell's law is the ratio of "sine i" divided by "sine r" ; where i = angle of incidence and r = angle of refraction . Sine is a concept in TRIGONOMETRY.

It is also known as refractive index . in easy words it is the "velocity of light in air / vaccumm" divided by "velocity of light in the given medium"

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