Why is the prism spectrum more convenient for studying short-wavelength radiation, and for studying the long-wavelength

Why is the prism spectrum more convenient for studying short-wavelength radiation, and for studying the long-wavelength part of the spectrum or the spectrum in a wide wavelength range, it is more expedient to use the diffraction spectrum?

The prism spectrum is stretched in the short-wavelength part, and compressed in the long-wavelength part. In the diffraction spectrum, the dispersion is the same over all wavelengths.

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