Refraction Simulation (hexahedria.com)

That is a nice demo! My wife is teaching optics right now, this looks like something she could have her students explore with to get intuition for what happens in different situations.

Might as well add my one. It's not interactive, however it might give you an idea of why waves actually refract: http://youtu.be/y0gFrte5auQ?list=PLpYLorG2XEtQKD7uHC8dK1inU6...

It would be really nice if there was some text that mentioned you need to have WebGL enabled if it's not. And it might be nice if there were instructions or a description of what we were seeing.

Other than that, it looks really nice!

Nice. I wish I could add and arrange my own lens elements though!

This is pretty awesome stuff! I'd love to tinker with it and it sounds like a few others would like to as well. Do you have any plans to open source this?

Very cool! Could find an interesting numerical instability https://plus.google.com/photos/109059794947950815445/albums/...

This is fun, though I wish there was an option for white light - and a traditional prism!

Very nice. Thank you.

Best part: Chrome lets you right-click/Save As... to download a snapshot of these beautiful simulations.

Human eye with cornea, iris and lens and would be a nice addition for physiology students! :)

It reminds me of zen photon garden : http://zenphoton.com/ (which doesn't have lens or fiber-optic, but is very pretty).

Very nice! Looks like the author just started at HMC, from his about page. (http://www.hexahedria.com/about/)

Impressive kid.