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Effect of combining two source of light

  1. Sep 15, 2014 #1
    I wonder to know what would happen when we use two flashlight in a same direction. by doing so, do we extend the range of light?
    if so, does it mean if the lights cross each other in a point perpendicularly the range that the light can traverse is going to reduce ?
    I have been said that if we create a hole on a surface and put it in front of a light source, the beam that we created going further? if is it true What is the reason?
    Tnx
     
  2. jcsd
  3. Sep 15, 2014 #2

    NascentOxygen

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    Staff: Mentor

    Hi mohammadyou, welcome to the Physics Forums.

    You could say that a pair of flashlights will extend the useful range.

    Light beams can cross and they'll always emerge undiminished.

    I guess a piece of reflective material, with a hole, placed over a flashlight could give a slightly stronger beam, but only slightly. You probably wouldn't notice it without instrumentation. Why do you think the beam might be a little bit brighter?
     
  4. Sep 15, 2014 #3
    Thanks NascentOxygen,
    Which kind of rule takes place that useful range with extend ? (thought Physics is not my field )
    I do agree with you, the power that added to beam is not too much but
    some people use this trick in a sender and receiver infrared to extend their range !!!
    and I consider this power negligible
     
  5. Sep 15, 2014 #4

    NascentOxygen

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    Staff: Mentor

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