| 31. | Is the speed of light ( i . e . phase velocity ) in a medium with Laplace operator.
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| 32. | A common misconception occurs between phase velocity and group velocity ( analogous to centres of mass and gravity ).
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| 33. | The main difference between these two groups is the behaviour of the phase velocity when the frequency approaches zero.
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| 34. | Such a material allows an electromagnetic wave to convey energy ( have a group velocity ) against its phase velocity.
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| 35. | The first superprism also modified group velocity rather than phase velocity in order to achieve the " superprism phenomena ".
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| 36. | Really, the best way to think of group and phase velocity is that the shape of the wavelet changes.
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| 37. | At its nascent frequency, each of these modes has an infinite phase velocity and a group velocity of zero.
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| 38. | Where V group is the group velocity, V phase is the phase velocity, and ? is the wavelength.
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| 39. | The ratio between and the phase velocity is called the refractive index or index of refraction of the material ( ).
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| 40. | :The " phase velocity " is the velocity at which a wave of a single frequency will propagate.
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