Is anyone familiar with the "y n u" ray trace method for optical systems, using paraxial rays where Snell's law is approximated using:(adsbygoogle = window.adsbygoogle || []).push({});

n_{1}sinx_{1}≈ n_{1}tanx_{1}

≈ n_{1}u_{1}= n_{2}u_{2}

If anyone is familiar with this, I'd be interested to discuss the finer points of "a-ray" and "b-ray" tracing, as well as aperture stops, as I don't quite understand the methods involved. Thanks.

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# Optical Ray tracing

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