NASA has put several optical corner reflectors made of quartz, known as the Lunar Laser Ranging Experiment, on the Moon for use in laser time-of-flight measurement to measure the Moon's orbit more precisely than was possible before.
32.
As long as none of the flat mirrors face the emitter, and as long as none of the flat mirrors reflect each other ( so they don't create " corner reflectors " ) . . . then there will be very little reflected waves.
33.
Corner reflectors are better at sending the light back to the source over long distances, while spheres are better at sending the light to a receiver somewhat off-axis from the source, as when the light from headlights is reflected into the driver's eyes.
34.
For example, you could have a couple of focussed neutrino mirrors ( I mean corner reflectors ) on the bottom of your car which communicate ( via neutrino, no doubt ) with broadcast stations in several cities on the far side of the planet, which send tremendous beams of neutrinos back at them.
35.
As for seeing thins left on the moon from earth based telescopes, corner reflectors were left on the moon during some Apollo missions, and the reflections of earth-based lasers from them could immediately be detected from earth based telescopes at observatories in various countries as soon as the astronauts ssaid they had deployed them.
36.
A corner reflector made of three surfaces at right angles will reliably bounce radar right back to it's source and sticks out like a sore thumb-but any concave junction between two surfaces does that to some degree and is basically undesirable for a stealthy design . talk ) 01 : 31, 28 June 2010 ( UTC)
37.
Now if it is both smoke and mirrors ( say, a swarm of nanobot corner reflectors tethered in formation ) then you have a mirror around a warm spot-essentially a space blanket, effective but not as good as a thermos, since heat is still readily transmitted by contact . talk ) 18 : 20, 18 February 2011 ( UTC)
38.
In which k B is the Boltzmann constant, ? is the free-space wavelength, and ? is the dihedral corner reflector with facet size, a, of 10 cm ( ? = 12 a 4 / ? 2 ), the rear of a car ( ? = 20 m 2 ) and for a non-evasive fighter jet ( ? = 400 m 2 ).
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