5 votes

Isn't Descartes' account of refraction wrong?

The point is the Descartes also argues that light should move faster in the denser medium, contrary to what happens with a tennis ball. In one of his notebooks, he wrote: "Since light can be ...
Marcel's user avatar
  • 151
4 votes

How did the earliest measurements of lasers bounced off of Apollo 11 retroreflectors deal with the light from the Moon and pick out single photons?

The short article in the IEEE Transactions on Nuclear Science (link, DOI: 10.1109/TNS.1972.4326697, S.K. Poultney "Single Photon Detection and Timing in the Lunar Laser Ranging Experiment", ...
Jon Custer's user avatar
  • 1,197
4 votes

What laser technology/ies were first used to bounce off of the Apollo 11 retroreflectors to accurately measure distance to the Moon?

A short article in the IEEE Transactions on Nuclear Science (link, DOI: 10.1109/TNS.1972.4326697, S.K. Poultney "Single Photon Detection and Timing in the Lunar Laser Ranging Experiment", ...
Jon Custer's user avatar
  • 1,197
3 votes

Technical papers or monographs without a single mathematical equation

I read something like that about Faraday's treatise (book?) (if I remember correctly, there was just one formula there). As for Faraday's mathematical abilities, opinions vary. I will try to find a ...
akhmeteli's user avatar
  • 961
3 votes

Light propagated instantaneously rather than gradually

What Roemer was says is that the astronomer's predictions were based on an infinite speed of light, but this is not correct: The speed of light is finite and the extra time it takes light to cross ...
Mark Olson's user avatar

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