Diffraction Grating Slides, Linear, 500 Line/Millimeters, Made in USA, Package of 50

There's a potential for confusion regarding how this product works. This is a "single axis" diffraction grating which means you'll see the point source of light ... and you'll see the rainbow "smear" of the color spectrum produced by that light which will appear both left and right of the point source. Hence the name "linear" diffraction grating because it's all in a nice line. However, you WILL need to hold this VERY close to your eye (perhaps an inch or so away) and will still likely need to look out to one side to see the spectrum. That's just the physics of how the prisms are working - not a product defect.One other caution... avoid touching the film with your fingers (or anything else that might leave any oily residue behind). The gratings are basically a 1000 tiny prisms in every inch. If you touch the film, your fingerprint oils will fill in the gaps between each micro-prism and that will prevent the light from being diffracted correctly.I use these to do explain spectroscopy when doing science outreach. In my case I start with an ordinary tungsten filament light bulb, but then switch to using gas tubes with various gas elements (hydrogen, helium, etc.)

We built take-home STEM kits for our students, and these grating slides were a perfect addition to our program's astronomy class. They are well-constructed and will "hopefully" hold up well to student use (they are students, so no guarantees!). The price was great, too!

Colors are hard to see.

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.

Is it not supposed to be spreading horizontally? 🤔I watched a lot of videos online and thought the spreading should be horizontal, just to realize it was rather vertical....

Pretty cool to see spectrum lines. Can't wait to find sodium and mercury lights.

I purchased these actually as party favors for a science party and my toddler has since become fascinated by them. They function as expected and decompose various light sources into their appropriate spectra. Try looking through them at car headlights, smartphone screens, various lamps, pretty much anything illuminated.

The defraction gratings DO NOT WORK. Very disappointed.

La verdad funcionan de maravilla, puede ver el espectro electromagnético de varios gases nobles.

ok

Entgegen meiner Befürchtung kam die Sendung tatsächlich sogar deutlich vor dem angekündigten Termin. Will man nur eine extrem dominante, annähernd punktförmige Lichtquelle "untersuchen" so genügt im Prinzip dieses Dia mit der Rillenfolie alleine und man kann wunderbar das vorhandene Spektrum sehen. Für komplexere Lichtverhältnisse muß man natürlich das ganze etwas aufbereiten und mit Lochblende und Fokusierung nachhelfen. Wellenlängen können anhand der auf den Diarahmen aufgedruckten Skala ungefähr abgeschätzt werden, für eine genauere Betrachtung der Wellenlängen wäre vielleicht das ebenfalls angebotene Papp-Falt-Kit anzuraten, welches eine Skala in das sichtbare Fenster einblendet.Eine sehr günstige und platzsparende Alternative zum Prisma - für den Unterricht und kleinere Experimente sollte dieser Artikel prima verwendbar sein.

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

Bild hat mit der Realität nix zu tun