Snell's Law, also known as the Law of Refraction, is a formula describing the relationship between the angles of incidence and refraction when light (or other electromagnetic radiation) passes between two media:
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is the angle measured from the normal (the line perpendicular to the surface)
is the velocity of light in each medium (m/s)
is the refractive index in each medium (no unit)
is the wavelength of the light in each medium (m)
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