3 ms·
> For a real light source, one that has an area, you can at best focus it down to the same area. I'm not an optics expert, but this can't be true. You can clea
by speedplane 8y ago
> For a real light source, one that has an area, you can at best focus it down to the same area.
I'm not an optics expert, but this can't be true. You can clearly focus light emitting from an area into a smaller area (although probably not to an infinitesimally small area).
- Dylan16807 8y agoYou can focus 1/100 of the light onto 1/100 the area. Or 1/1000 of the light onto 1/100 the area. You can't increase the density of the light. You can't focus all of it onto a smaller area. Is that clearer?