Effect of combining two source of light

[mohammadyou]

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

 

[NascentOxygen]

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

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?

 

[mohammadyou]

You could say that a pair of flashlights will extend the useful range.
Light beams can cross and they'll always emerge undiminished.

Thanks NascentOxygen,
Which kind of rule takes place that useful range with extend ? (thought Physics is not my field )

Why do you think the beam might be a little bit brighter?

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

 

[NascentOxygen]

If you double the number of sources, you are doubling the illuminating power. For the same intensity, the range will extend by a factor of √2, by this reckoning. Intensity follows an inverse-square law. http://www.portraitlighting.net/inversesquare_law.htm

 

[sardar]

I can provide some insights on the effect of combining two sources of light. When two flashlights are used in the same direction, the range of light will most likely increase. This is because the light from both flashlights will combine and create a brighter and more intense beam of light. This can be seen in everyday life when stage lights are used in concerts or performances to create a more powerful and focused beam of light.

However, if the lights cross each other perpendicularly, the range of light may not necessarily decrease. It will depend on various factors such as the intensity and angle of the lights, as well as the reflective properties of the surface they are shining on. In some cases, the intersecting lights may even create a new area of brighter light.

Regarding the creation of a hole in a surface and putting it in front of a light source, it is true that the beam of light will travel further. This is because the hole acts as a lens, focusing the light and allowing it to travel in a more concentrated and directed manner. The reason for this is due to the principles of optics, where light is refracted and focused when passing through a medium with different densities.

I hope this helps to answer your questions. It is always fascinating to explore the properties and behavior of light, and I encourage you to continue asking questions and learning more about this topic. Thank you.