Category: Efficiency Prizes

The Action Lab: Lasers, LEDS, lenses and focusing intensity to burn or illuminate things, vortex pressure

The Action Lab: What Happens if You Focus a 5W Laser With a Giant Magnifying Glass? Negative Kelvin Temperature! at The intensity in Watts/meter^2 is roughly equal to the Stefan-Boltzmann constant times the 4th power of the temperature in Kelvin. When you focus parallel rays to a smaller area, the intensity goes up, and the
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