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Optical axis (coincides with red ray) and rays symmetrical to optical axis (pair of blue and pair of green rays) propagating through different lenses.
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The optical axis defines the path along which light propagates through the system, up to first approximation. For a system composed of simple
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Line along which there is some degree of rotational symmetry in an optical system
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is an imaginary line that passes through the geometrical center of an
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