| 31. | The longer answer includes the fact that light slows down in matter ( see index of refraction ).
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| 32. | Its index of refraction is 1.443.
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| 33. | In gemology a different type of refractometer is used to measure index of refraction and birefringence of gemstones.
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| 34. | The index of refraction links these two ideas . Jburt1 23 : 05, 8 March 2006 ( UTC)
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| 35. | The plasma has an index of refraction lower than one, and causes a defocusing of the laser beam.
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| 36. | Under such conditions, power is refracted through an effectively negative angle, which implies an effectively negative index of refraction.
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| 37. | To achieve a negative index of refraction, however, permittivity with negative values must occur within the same frequency range.
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| 38. | These can be thought of as moving periodic planes of expansion and compression that change the index of refraction.
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| 39. | The index of refraction is the velocity of light in a vacuum divided by the velocity of light in medium.
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| 40. | They also have electrodes on either side of those materials that apply the voltages to change the index of refraction.
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