Unanswered Questions on Light: Control & Visibility

  • Context: High School 
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Discussion Overview

The discussion revolves around questions regarding the control of light beams and the visibility of different forms of light in daylight and air. Participants explore theoretical and practical aspects of light behavior, including visibility conditions and potential applications.

Discussion Character

  • Exploratory
  • Conceptual clarification

Main Points Raised

  • Julian questions whether it is possible to control the length of a light beam.
  • Julian also inquires if there are forms of light that can be visible in daylight and air without additional effects like haze machines.
  • One participant suggests that controlling the length of a light beam is not feasible in the way Julian proposes, stating that blocking the beam is the only method to limit visibility.
  • This participant notes that light must enter the eye to be seen and that visibility typically relies on reflecting light into the observer's eye, often aided by particles like dust or smoke.
  • A light-hearted comment is made about the possibility of building a lightsaber, implying a playful interpretation of Julian's inquiry.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the feasibility of controlling the length of a light beam or the types of light visible in daylight. Multiple viewpoints are presented, and the discussion remains unresolved.

Contextual Notes

There are limitations in the assumptions made about light behavior and visibility conditions, particularly regarding the definitions of "controlling" a light beam and the types of light that can be visible without additional mediums.

julez520
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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
 
Science news on Phys.org
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.
 
Someone wants to build a lightsabre, huh? ;)
 
Thanks for the reply s so far

and no light sabres lol
 

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