Image formation with multiple wavelengths – simulation [video] | Hacker News Reader

Image formation with multiple wavelengths – simulation [video]

youtube.com

45 pointsnothacking_9 comments

Nils Berglund posts many very similar simulation videos.. https://youtube.com/@NilsBerglund

If you enjoyed that, I can recommend the section in this video about computational photolithography in ASML machines.

https://www.youtube.com/watch?v=rdlZ8KYVtPU

Fabulous, thanks. Great to learn how ASML gets around wavelength and numeric aperture limits - just gotta see a different angle on the problem!

How would this be explained to a non-physicist? The video description doesn't really help (not complaining, I am sure I'm not the intended audience here).

At least one of the effects in the video (different wavelengths responding differently going through a clear object) is shown much better with this type of video.

https://upload.wikimedia.org/wikipedia/commons/f/f5/Light_di...

The red (long) wave lengths only get bent a little bit. The purple (short) wave lengths get bent a really large amount.

The video linked is basically simulating something like a red lightbulb (750 nm) and a purple lightbult (375 nm) shining through a glass lens simultaneously. See this article on lenses and lens phenomena:

https://en.wikipedia.org/wiki/Lens

Or, simply go try this optics simulator, which gives a much better ability to play around with the ideas. The link shared should go to an example that's almost the same.

https://phydemo.app/ray-optics/simulator/#XQAAAAIDAgAAAAAAAA...

Don't turn the rays up to much though or it will cripple your GPU unless its high end. Color simulation can be turned on/off on the upper-right settings (it's a huge resource hog compared to no color effects).

This is fantastic. Thank you very much.

It’s true that light of different frequencies bends a different amount, but that’s not really what this simulation shows. This simulation shows that the lens forms an image of both light sources simultaneously, even though they are emitting at different frequencies. The light inside the lens looks uniformly mixed but still comes out in such a way that the two frequencies separate and form two distinct images.

Of course, you might consider it to be even more remarkable that two distinct images are formed even when the two lights are the same color, since then there is no longer any obvious way to distinguish the light from the two sources.

I made a sim that visualizes the different wavelengths as colors here:

https://quazikb.github.io/WaveEq/index.html

Very nice.

Reply on news.ycombinator.com