What are monochromators? Describe the working of a grating monochromator. In what way is the standard addition method of calibration in UV-VIS spectrophotometry better than the standard solution method?

Monochromators are optical devices used to isolate a specific wavelength of light from a broader spectrum. They are widely used in spectroscopic methods to allow the selection and analysis of a narrow band ______ _________ _______ ______ ___ _____ ___ _______.
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