Rainbow Symphony Diffraction Grating Glasses - Linear 500 Line/millimeters, Package of 10

I got these for class demonstrations of spectra, thinking they would be easier to use than hand-held 2x2" slide-mount gratings, and they are indeed very handy, leaving hands free and also allowing both eyes to participate. There is no need for users to worry about where to hold the grating or what the orientation should be. The glasses are also larger and more visible than slides and easier to keep track of after the lesson.As implied by the product photos, the spectra are dispersed horizontally (grating rulings vertical), which is most convenient with most lab sources and easy for students to understand. With the relatively coarse 500 lines/mm, both first and second order spectra are visible. [ I also purchased a pack of the 1000 lines/mm glasses Rainbow Symphony Diffraction Grating Glasses - Linear 1000 Line/Millimeters, Package of 50 for studies requiring higher dispersion, but these, alas, turned out to have the gratings oriented differently, with the spectra dispersed vertically.]

I use these for spectroscopy demonstrations. The diffraction grating glasses split the light wavelengths into their constituent parts so it's easy to determine which "colors" are being emitted by the light source.These are "linear" meaning you'll get one axis. There are versions of these that create multiple axes (and that looks really cool... but not as useful for teaching purposes.)I buy these in bulk from time to time since they are basically give-aways. Buying in small quantities is too expensive when you're giving one away to each audience member.

Great for light spectrums with bulbs and tubes awesome better than a prism anyday

This kids had fun with these on eclipse day (not looking at the sun, of course).

The fifth grade students were delighted to use the diffraction grating glasses to view assorted continuous and emission line light sources.

Kids love em! Couldn't keep them away once the kids knew what they were.