👉 A pyroscope is a type of spectrograph that uses a sample of an unknown substance to measure its specific absorption spectrum. It consists of a prism and a sample tube, with a sample placed in between the two. When light passes through the sample tube, it will be scattered in all directions, creating a pattern on the prism. The intensity of this pattern is proportional to the concentration of the substance present at that wavelength. The pyroscope can be used to determine the chemical composition and structure of a