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Light Pyshics

  1. Aug 4, 2009 #1
    Hi

    I have to question which i can not find any information on

    !st question: is it possible to control the length of a light beam

    2nd question: is there any form of light which are viable in daylight and air without the use of a haze machine

    or is the plasma phenomenon the only visible light

    Thanks

    Julian
     
  2. jcsd
  3. Aug 4, 2009 #2

    mgb_phys

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    You can control the length of a light beam by putting something in the way to block it!
    You can't preset a light beam to only travel X metres.

    You can only see light if enters your eye. Light travels in a straight line so the only way to see a light beam is to reflect light out of the beam into your eye (assuming you aren't looking directly into the source!) this is what dust or smoke does.
     
  4. Aug 4, 2009 #3

    negitron

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    Someone wants to build a lightsabre, huh? ;)
     
  5. Aug 4, 2009 #4
    Thanks for the reply s so far

    and no light sabres lol
     
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