Demo Diffraction Grating, 20mm X 10mm, Grating 100, 300, And 600 Lines, 1 Each

The Demo Diffraction Grating by United Scientific is a demonstration slide with three 20 mm x 10 mm gratings of 100, 300, and 600 lines per mm, mounted between glass plates, each with a 15 mm x 10 mm viewing area. Physics teachers use it with a laser pointer or light source to show how line density changes diffraction angles and to calculate wavelength from measured order spacing.