Diaphragm with 4 Double Slits of Different Spacings

Use red laser pointer, mount slide, position laser light on double slit, and, ta da!, get a great interference pattern demoing the wave-like behavior for light. So simple, so weird, so cool.

I purchased this as I have an interest in quantum mechanics. This slide plus a laser pointer very accurately show the quantum effect showing light as both a particle and a wave. This is a great part of a shcool scientific project.

I used this to show my wife evidence of multiple universes. I think in the one we live in, she doesn't understand. But, in some other universe I know she gets it!

Scratching tiny, neat, parallel, lines on a candle-soot-covered glass slide is a pain in the neck, and the tinier and closer you want, the harder it is. These provide four different pairs, and are just about perfect.Downside: it takes American 3B Scientific forever to get back to you when you order them.However, they're the only game in town, and they are really top quality. Well worth the investment, but take very good care of them, because replacing them is going to be a long, expensive wait.

Nice

Super disappointed in this belong listed as a 4 pack -- it is not 4 different slides. It is a single slide with 4 sets of slits on it.I have yet to try it, but the slide does appear to be of good quality and am otherwise happy with it.

received only 1, advertised pack of 4

The slits worked great. However, I misunderstood the product description and was expecting a pack of 4 plates, not 1 plate with 4 different sized slits. Thus the students were forced to take turns when trying the double slit experiment.