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Credit
Dr MacMunn's spectroscope, comprising of one prism and with the scale-tube illuminated by a mirror. The spectroscope is an instrument employed for the analysis of light into its components. This illustration is taken from page 10 of 'Spectrum Analysis Applied to Biology and Medicine' by C A MacMunn. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.