einfach_orangensaft@feddit.de to NonCredibleDefense@sh.itjust.worksEnglish · 9 个月前The Math would add upfeddit.deimagemessage-square163fedilinkarrow-up1480arrow-down123
arrow-up1457arrow-down1imageThe Math would add upfeddit.deeinfach_orangensaft@feddit.de to NonCredibleDefense@sh.itjust.worksEnglish · 9 个月前message-square163fedilink
minus-squarenicoweio@lemmy.worldlinkfedilinkEnglisharrow-up3·9 个月前I’m not sure about the easy-to-show part, but take a look at the Brightness Theorem / Conservation of https://en.wikipedia.org/wiki/Etendue if you want to learn more.
minus-squareRedjard@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up3·9 个月前The easy to show part was the second sentence of my comment. This is really useful physics trivia, because the basic truth is easy to show from a simple law, but the detailed explanations go quite in-depth. With lenses, you trade bewteen angular accuracy and light density. For a challenge, try it with LEDs. Where do you find the source “temperature”, you can get from focusing an LEDs light?
minus-squarenicoweio@lemmy.worldlinkfedilinkEnglisharrow-up2·9 个月前That’s an intriguing question. My first guess would be it corresponds to the diode’s band gap?
minus-squareRedjard@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up1·9 个月前Thats definitely hugely relevant, yes.
I’m not sure about the easy-to-show part, but take a look at the Brightness Theorem / Conservation of https://en.wikipedia.org/wiki/Etendue if you want to learn more.
The easy to show part was the second sentence of my comment.
This is really useful physics trivia, because the basic truth is easy to show from a simple law, but the detailed explanations go quite in-depth.
With lenses, you trade bewteen angular accuracy and light density.
For a challenge, try it with LEDs. Where do you find the source “temperature”, you can get from focusing an LEDs light?
That’s an intriguing question. My first guess would be it corresponds to the diode’s band gap?
Thats definitely hugely relevant, yes.