Figure 1. Spectrometer setup (top) with the essential slit, sample department and diffraction grating parts (bottom)

From

An Experimental Introduction to Basic Principles of the Interaction of Electromagnetic Radiation with Matter

Patrick Schairer, Stephan Wagner, Ekkehard Geidel

World Journal of Chemical Education. 2018, 6(1), 29-35 doi:10.12691/wjce-6-1-6