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Posted

is it possible to take the color out of light so that a shadow comes out of a flashlight instead of normal light?

Posted

umm, no.

 

the colour of light is dependant on its wavelength, if you use a wavelength that the human eye can't detect the beam will be invisible but it will not appear as if a shadow is coming out of it. a shadow is the absence of light.

Posted
  insane_alien said:
umm, no.

 

the colour of light is dependant on its wavelength, if you use a wavelength that the human eye can't detect the beam will be invisible but it will not appear as if a shadow is coming out of it. a shadow is the absence of light.

 

Specifically, a shadow is a spatial absence of light, and color is an issue of the spectrum.

Posted

no, changing the wavelength of light will not alter the fact that the light is there.

 

thats like saying 'can you paint a prisoner a certain colour so that he is no longer in prison?'

Posted

You'd have to physically block the beam (or apply some other effect, like interference). If the light is there, it's there. It doesn't matter what the wavelength is.

Posted

there isent some way that we use 2+ waves together that will cancel each other out or tamper one another?

Posted

so its not possible to have an absence of light emit from some type of machine?

 

or have 2 waves interfear with each other to make an absence?

Posted
  Xain said:

or have 2 waves interfear with each other to make an absence?

 

Yes, that's possible under the right circumstances. A very narrow slit (or slits) in front of a light source will yield bright spots and dark spots.

 

The easiest way for a source to emit no light (ignoring thermal effects) is to not turn it on.

Posted

kalynos sais it cant happen

 

but you say that you can make a shadow emit from it with a machine?

Posted
  Xain said:

but you say that you can make a shadow emit from it with a machine?

 

No, that's not what he said.

 

 

So, you want to emit a shadow. What is this shadow? IIRC, there's no such thing as a shadowon.

Posted

so its not possible to turn on something similar to a flashlight and have multiple waves interfere with each other and create an absence or shadow come out of it?

Posted
  Xain said:
so its not possible to turn on something similar to a flashlight and have multiple waves interfere with each other and create an absence or shadow come out of it?

 

It's very simple.

 

Step one:

Get a flashlight.

 

Step two:

Don't put batteries in it.

Posted
  Xain said:
you going to make a shadow come out of a flashlight like that?

 

It's a more even effect than trying for interference and it's easier.

Posted

Xain,

 

It's an interesting question, I think, but the only to make a shadow is to physically block the light shining on the object. So, you'd be better off with a really big umbrella in front of the light source than some really complex nifty tool that measures the light and tries to interfere with it by emitting it's own light.

Posted
  Xain said:
so its not possible to turn on something similar to a flashlight and have multiple waves interfere with each other and create an absence or shadow come out of it?

 

An absence of light (shadow) is not an entity, so it can't be emitted by a device. What you can do, under some circumstances, would be to have two light sources interfere, an this would give you dark regions. Light is being emitted, but it destructively interferes when it's 180º out of phase with other light.

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