Diffraction-Grating Rainbow

Multiple spectra appear on both sides. Ask students to predict what will happen. View a narrow white light through grating. Key idea: Closely spaced lines make different wavelengths interfere at different angles. Ask: How is this rainbow different from a prism rainbow? Safety and cleanup: Do not view Sun through grating. https://www.google.com/search?q=%22Diffraction-Grating+Rainbow%22+science+demonstration+experiment