paraxial approximation
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ray
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Wolfram Research
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International Standard Book Number
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lens
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radian
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Maxwell's equations
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Taylor series
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geometrical optics
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physical optics
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Wolfram Alpha
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dimensional analysis
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optical axis
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Eric W. Weisstein
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Gaussian beam
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small-angle approximation
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SPIE
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ray transfer matrix analysis
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Wolfram Demonstrations Project
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Gaussian optics
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Orders of approximation
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