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Lecture Notes - Optics 4: Retardation, Interference Colors ...

Lecture Notes - Optics 4: Retardation, Interference Colors In anisotropic crystals, the two rays of light produced by double refraction travel at differentvelocities through the crystal. It takes the slow ray longer to traverse the crystal than it takes thefast ray. The fast ray will have passed through the crystal and traveled some distance beyondthe crystal before the slow ray reaches the surface of the crystal. This distance is called theretardation. The retardation may be calculated as follows. If tS is the time in seconds that it takes the slowray to traverse the crystal and tF is the time it takes the fast ray to traverse the crystal, then thedistance that the fast ray travels beyond the crystal before the slow ray emerges is = c (tS - tF) {units: m = (m/s)(s)},where c is the velocity of light in a vacuum, which is very close to t

Lecture Notes - Optics 4: Retardation, Interference Colors • In anisotropic crystals, the two rays of light produced by double refraction travel at different velocities through the crystal. It takes the slow ray longer to traverse the crystal than it takes the fast ray.

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