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Subject: 
Re: Evolution of Earth and moon (was: Couldn't resist)
Newsgroups: 
lugnet.space, lugnet.off-topic.geek
Date: 
Thu, 12 Jul 2001 00:32:35 GMT
Viewed: 
9245 times
  
In lugnet.space, Larry Pieniazek writes:

Would there be any difference in the accuracy of laser vs. radar? I'm not
enough of an EE geek to know, but thought "no" because they're just
different wavelengths of the same thing, right?

Or does the wavelength difference (it IS many orders of magnitude in
difference) matter?

Isn't the theory behind rainbows (or light spectrums in general)
that the different wavelengths refact by differing amounts, and
so white light is "spread" into a spectrum of colours?  If that's
the case then radar and laser energy would refract by differing amounts,
meaning one would end up being more likely to deviate from a
straight line in our atmosphere, and add errors to the measurement.
It would also presumably scatter more so the "signal" loses "power"
more.

KDJ
_______________________________________
LUGNETer #203, Windsor, Ontario, Canada



Message has 1 Reply:
  Re: Evolution of Earth and moon (was: Couldn't resist)
 
(...) My first inclination is that there should not be a difference. When measuring distances with light, the accuracy *can* be limited by the wavelength. I think one can measure accurately down to roughly half the wavelength of the light used. I (...) (23 years ago, 12-Jul-01, to lugnet.space, lugnet.off-topic.geek)

Message is in Reply To:
  Re: Evolution of Earth and moon (was: Couldn't resist)
 
(...) Would there be any difference in the accuracy of laser vs. radar? I'm not enough of an EE geek to know, but thought "no" because they're just different wavelengths of the same thing, right? Or does the wavelength difference (it IS many orders (...) (23 years ago, 11-Jul-01, to lugnet.space, lugnet.off-topic.geek)

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