Rainbow Symphony Pack of 10 Diffraction Grating Slides - Double Axis 13,500 Lines/inch

Used this grating with a red laser pointer to demonstrate diffraction to a bunch of lucky chemistry students. I really hope they learn Bragg's law after I went to so much trouble.

If you are after fun with solar spectrum then this is for you it is on a 35 mm slide and that helps

For a course on optics I ordered a Pack of 10 Diffraction Grating Slides - Linear 500 Lines/mm. The slides were packed and delivered well and work well.

The gratings and their frames were all well made, and there were no defective ones in my set.The packaging was adequate, and none were damaged in shipping.They are suitable for making the "Home made spectroscopes" that have instructions all over online.

Excellent for a physics class - or to interest grandchildren. The vaying spectra of the new LED lights show up well when viewed through one of the gratings.

As described, quick delivery

asked for a return on the item. Seller never responded.

It's a nice quality grating, but unfortunately it's not 13,500 lines/inch as specified. It's almost exactly 5,000 lines/inch, which you can get from the diffraction grating formula using a laser pointer: λ = d sin(θ). Measured θ = 0.1285 radians, λ = 650nm.

Product came as advertised

Excelente producto es lo que ofrecen

Used to use these in physics class when learning about light. I have no idea where these are produced but it's the exact same look with the odd rainbow colored cardboard holder.Regardless of how they look they work perfectly fine for demonstration purposes, the grating line-count is accurate. It handles low power lasers perfectly fine, it might not handle high powered lasers seeing as it's only plastic, but for this price I wouldn't expect it to, so I haven't bothered to try it.

Le produit est parfait mais attention une taxe de 9euros s'applique pour un produit qui coutait autant...merci le fisc!

These are great for understanding how lighting works. If you look at an incandescent light bulb through the slide and a little askance, you see a stretched out version of the light that looks like a rainbow.But if you look at a fluorescent source, you instead see multiple copies of the fixture in discrete colors (shades of red, green and blue) that reveal that the light comes from phosphors that emit these colors. Even if these lights claim to be "full spectrum", the actual spectrum is a discrete sampling of frequencies which together let us see as if the full spectrum were present. Various industrial lights, such as metal halide parking lot lights, have unique and identifiable spectrums.If you want to tell one type of light from another, these slide are infinitely more portable and cheaper than $5000 electronic meters! That said, people don't immediately get the knack of looking askance at a light through a slide. A fancy meter will work better for customer presentations.