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The performance of a semicircular magnetic spectrograph and spectrometer has been studied from the point of view of the Fourier-analysis. The approximate expression for the intensity distribution of the image is given and the spatial frequency response has been calculated as in the field of lens optics. The applications of the theory are described for (i) determination of the optimum condition of experiments (ii) evaluation of the performance of spectroscope (iii) estimation of the input spectrum through the output and for (iv) measuring intervals for discrete recording. The approach described here may be useful for the comparison of performance of various different types of magnetic spectroscopes and may give the first step to introduce information theory into the problem of magnetic spectroscopy.
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Shinoda et al. (1962) studied this question.
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