@[email protected] to [email protected]English • 9 months agoThe Math would add upfeddit.deimagemessage-square160fedilinkarrow-up1486arrow-down124
arrow-up1462arrow-down1imageThe Math would add upfeddit.de@[email protected] to [email protected]English • 9 months agomessage-square160fedilink
minus-square@nicoweiolinkEnglish3•9 months agoI’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-squareRedjardlinkfedilinkEnglish3•9 months agoThe 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-square@nicoweiolinkEnglish2•9 months agoThat’s an intriguing question. My first guess would be it corresponds to the diode’s band gap?
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.