Abstract

This paper discusses how expressions for the second-order aberration coefficients obtained by means of the optical path function and analytical expressions for accurately calculating the ray path are associated with semiempirical formulas that take first-order astigmatism into account. It is shown that these formulas need to be supplemented by including in them the dependence of the spectral image on defocusing.

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Theory of the Concave Grating. I*†

T. Namioka
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