• Redjard@lemmy.dbzer0.com
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      10 months ago

      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?