Unanswered Questions on Light: Control & Visibility

[julez520]

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

 

[mgb_phys]

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.

 

[negitron]

Someone wants to build a lightsabre, huh? ;)

 

[julez520]

Thanks for the reply s so far

and no light sabres lol