Long description: Figextra2
Alt text: A diagram showing a sequence of optical components labeled k, m, k, and m, which are associated with light paths labeled \(\text{y}_1\) and \(\text{y}_2\).
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- The diagram illustrates a sequence of optical elements arranged linearly, consisting of components labeled k, m, k, and m, followed by another component labeled k.
- These components are connected in series, suggesting a system path.
- Below the structure, there are arrows indicating specific paths: a dashed line connects the first component (k) to a point labeled \(\text{y}_1\), and another dashed line connects the second component (m) to a point labeled \(\text{y}_2\).
- The components appear to represent optical elements, such as lenses or gratings, given the context of diffraction equations, with 'k' and 'm' labeling different types of elements.