What is a wave? The one-dimensional wave equation
What is a wave? The one-dimensional wave equation
What is a wave? The one-dimensional wave equation
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2/3/14D<strong>is</strong>persion: phase/group velocity depends on frequencyBlack dot moves at group velocity. Red dot moves at phase velocity.Th<strong>is</strong> <strong>is</strong> anomalous d<strong>is</strong>persion (refractive index increases with increasing λ)Normal d<strong>is</strong>persion of v<strong>is</strong>ible lightShorter (blue) <strong>wave</strong>lengths refracted more than long (red) <strong>wave</strong>lengths.Refractive index of blue light > red light.5
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