= Ray transfer matrix analysis
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= Ray transfer matrix
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<Ray transfer matrix analysis> propagates paraxial ray height and slope with a two-by-two <matrix>. Free propagation through $L$ uses $\left(\begin{smallmatrix}1&L\\0&1\end{smallmatrix}\right)$, a thin <optical lens> uses $\left(\begin{smallmatrix}1&0\\-1/f&1\end{smallmatrix}\right)$, and an unfolded concave-mirror reflection uses $\left(\begin{smallmatrix}1&0\\-2/R&1\end{smallmatrix}\right)$. Multiply matrices in propagation order, with the first operation at the right.
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