Troll - 1

Classical Mechanics Level pending

Is it possible to have something like this!

  • Picture is not original, taken from internet
  • Read picture from top left to right , similar to the next Row
Only at the height = height of earth's Radius No Yes only at sun yes Only at moon

Syed Baqir by Syed Baqir , 24, Cyprus

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1 solution

Shubham Joshi
Sep 4, 2015

The top right picture is wrong because mirrors have polish on one side so the light cannot pass through it.It is opaque from one side.

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I think the "move faster than the speed of light" is becouse he wants to "trap" the light between the two mirrors before it reflects so it will keep "bouncing" from one mirror to the other infinitely....

For that you would need to build a perfect mirror (wich doesn't exist) sphere to "trap" light inside... but it would not be observable... since seeing, observing or measuring it would mean that some mecanism is absorbing photons.

But a lot of old style lasers are basically a beam of light trapped between two mirrors. The secret is that they're bouncing back and forth in an excited plasma that has an energy gap that electrons can jump down to and release more of that wavelength. The light triggers a cascade of coherent light. That supplements the light that's lost in the mirrors through heat.

You can't just bounce light back and forth without amplification because even if the mirror is .999999999% efficient and you've compensated for frequency spread and divergence (which I don't think can actually be done) it will have to bounce 999999999999999 times in just a second. If efficiency is 'e' and number of bounces is "b" the amplitude is reduced by eb, (probably).

If you were bouncing the light off the moon and back, it would take 1.3 sec to get there and 1.3 sec to get back, but your beam would diverge to about 1/6th the area of the moon so your beam wouldn't be visible. With very close mirrors your amplitude gets sucked up by the mirror losses. With far away mirrors it is lost by the divergence of the beam.

Bout you could go and try to build a Fabry-Perot Interferometer... which is essentially a pair of very high quality mirrors built for exactly this purpose

Marco Ariel Mávil Torres - 5 years, 9 months ago

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I agree. What is an optical laser, if not a beam of light continuously bounced between two end mirrors? In theory , there's nothing to bar sending a light packet to a remote mirror, say, on the moon (yes, we already have retroreflector mirrors there for astronomers bounce light from), and during the time of travel, quickly place another mirror at the other end before it returns. It's optically quite possible to design mirrors so that the bouncing is theoretically "indefinite"---which is a major design consideration for the end mirrors of an optical laser. The end mirrors of an optical laser has to be very slightly curved as to continually "bunch up" the light beam internally, so that it doesn't diverge over time.

Michael Mendrin - 5 years, 9 months ago

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You may include the example of Endoscopy for instance,

Syed Baqir - 5 years, 9 months ago

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