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Nanogasm

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(Originally posted on: 07-27-02 01:30:22 AM)
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I was thinking... if you took two movie projectors, each with their own movie screen, but you positioned the projectors so that the light beam of each projector's movie intersects each other.....what would be displayed on each screen?
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Reply 1 of 24 (Originally posted on: 07-27-02 01:40:46 AM)
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i'm pretty sure the screens showing the projected light would be the same. this is like, if you have an orange light in your room, and a white lightbulb as well. when you cast a shadow with your hand from the white light, the shadow is orange. light doesn't interfere with itself, it always travels in straight lines. if you take two flashlights and make them face a similar direction so that thier paths cross, they will still have the same pattern of light as they did without the other flashlight.

that's what i would assume anyway, maybe i misinterpreted your post.
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Reply 2 of 24 (Originally posted on: 07-27-02 04:01:29 AM)
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neither projection or beam of light would affect the other.
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Reply 3 of 24 (Originally posted on: 07-27-02 05:38:46 PM)
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NNY got it. (my first 1 line reply in SD)
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Reply 4 of 24 (Originally posted on: 07-28-02 12:24:38 AM)
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Quote:
light doesn't interfere with itself, it always travels in straight lines.


Not true. Like all waves, light interferes with itself. This can be seen in the double slit expieriment. If you're unfamiliar with this, if you shine a single light source at a piece of paper with two slits in it, and have a second screen behind the paper, you will see the interference pattern.

Here is the set-up.


"And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.
For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow." Ecc 1:17-18
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Reply 5 of 24 (Originally posted on: 07-28-02 02:13:14 AM)
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I'm pretty sure that's a different situation.
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Reply 6 of 24 (Originally posted on: 07-28-02 02:15:59 AM)
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Wouldn't that be because it was a round light? Try using a flat light, as on a projector.

I dunno... made sense in my head.
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Reply 7 of 24 (Originally posted on: 07-28-02 02:17:19 AM)
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light always, always travels in straight lines... i *did* take physics.
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Reply 8 of 24 (Originally posted on: 07-28-02 02:24:01 AM)
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I didn't mean the light was going in a round line....
Um... I can't explain. Here, jump into my head, walk around, and see what i see.
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Reply 9 of 24 (Originally posted on: 07-28-02 03:14:44 AM)
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nah, i knew what you meant, i wasn't talking about you
i meant what someone else said

i know you meant like a bulb that instead of a round bulb, it should be demonstrated by something that is partially blocked, as a projector.
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Reply 10 of 24 (Originally posted on: 07-28-02 03:40:05 AM)
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Quote:
I'm pretty sure that's a different situation.


It is, but I was just showing that light *does* interfere with itself.

Quote:
light always, always travels in straight lines


In the same sense that waves travel in straight lines, yes.
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Reply 11 of 24 (Originally posted on: 07-28-02 02:50:25 PM)
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Interesting. I myself didn't know the answer. From what I know of light, which is very little, every colour has its own wave length. I wonder if wavelength matters. For example, if you took two white lights and intersected their paths, would it have the same result as a blue light crossing a red light's path?

The way I see it, when a light of one colour hits a light of the same or another colour, it can do one or more of the following: Pass straight through it with no effect, pass through with decay to its wavelength, bend, reflect or absorb.
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Reply 12 of 24 (Originally posted on: 07-28-02 03:00:13 PM)
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well here, i'll try to remember what i know from a few years ago when i took this subject.

ok, lets say you have a blue light, and you project it against a wall. then you take a yellow light and project it against the same wall, what color does it make? green? no way. it makes ...ok, i don't remember exactly. this shows sort of what i mean

[EDITED FOR BANDWIDTH LEECHING!]

yeah, colors in light have a whole different sort of physics than paint.
even if you have a blue wall and shine a yellow light on it it makes a different color (again, i don't remember exactly what it makes, i just remember the whole theory) anyway, yeah, it makes a different color because yellow can only reflect certain colors. white reflects all colors, and black absorbs all colors.

EDIT: light can bend when it's going through a specific medium. such as water... or something like that
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This reply was last edited on 05-17-03 05:03:21 PM by Sunhasrahla.
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Reply 13 of 24 (Originally posted on: 05-16-03 08:40:20 PM)
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I'm just as much into discussing concepts as the next person, but why doesn't someone just get two projectors and TRY IT and see what happens???
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Reply 14 of 24 (Originally posted on: 05-17-03 01:35:02 PM)
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Because we don't need to.
I mean for real this time, or at least just kinda try!
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Reply 15 of 24 (Originally posted on: 05-21-03 08:31:06 AM)
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I don't think:
Light bends when it interactw with light. Does sounds bend when it inteacts with other sound waves, even though they are different types of waves?

And the colors you get when you cross blue and yellow lights is cyan, and red and blue is magenta, and red and yellow is...something else.
Dammit, I can't remember.

This is different than the double slit experiments, becasue in teh case that the original question is about, the light isn't interacting with a physical object, just another set of electromagnetic waves.
Unless you care to debate the physical nature of light? (I can't do that, I'm not knowledgeable enough).
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Reply 16 of 24 (Originally posted on: 05-21-03 04:56:06 PM)
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Actually, gravity can effect light. Look at black holes, they have gravitational fields that are so strong that light can't escape. As for the projector thing... We did that in science 2 years ago, the 2 didn't interfere with each other.
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Reply 17 of 24 (Originally posted on: 05-21-03 07:39:54 PM)
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Quoted from sprUceWOLF:
I'm just as much into discussing concepts as the next person, but why doesn't someone just get two projectors and TRY IT and see what happens???

You missed the point of it entirely. We're like the ancient philosophers like Aristotle and people like that, who just thought up things and never needed to go check them because we just KNEW that they were true.

Oh wait, Aristotle believed in spotanious generation.

Nevermind.
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Reply 18 of 24 (Originally posted on: 05-21-03 07:43:23 PM)
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Oh, and

BCM: Yes, sound does interfere with other soundwaves. If you have two speakers projecting the sound at the same frequency, but one has a phase shift forward or back one half the wavelength (and the two sounds have the same amplitude), you shouldn't hear anything as the waves cancel out.

The problem with the double slit experiment is that light can act as both a particle and a wave, situtation dependant. In addition, the double slit experiment really has more to do with quantom physics and Heisenberg's uncertainty principle than with the exact nature of light.

BA: Gravity doesn't bend light. Gravity bends spacetime, and light simply travels along the plane (bent plane maybe) of spacetime.
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Reply 19 of 24 (Originally posted on: 05-22-03 04:05:54 AM)
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What Jesus said about gravity. Light is still travelling in a 'straight' line, in the geodesic/non-Euclidean sense.

I think Young's experiment does not simply show that photons can act as both particles and waves. It shows that they DO act as both particles and waves. Your comment about HUP with regards to this is spot-on.
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Reply 20 of 24 (Originally posted on: 05-22-03 01:41:57 PM)
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Quoted from peach:
light always, always travels in straight lines... i *did* take physics.


EXCEPT:

when passing close to a blackhole...then light WILL bend, seeing that this is how we find blackholes...

when passing through anything that causes resistance to the speed of light such as the glass in a prism, water...that is how we see rainbows and can separate the color spectrum...if light didn't bend, we couldn't do this

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Reply 21 of 24 (Originally posted on: 05-22-03 07:24:50 PM)
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the simple answer to your question is: It depends on what angle you have the two beams intersecting and how far apart they are from each other. Certain times will create destructive interference and greatly destroy a lot of the images, other cases would be constructive and in certain places enhance the intensity. Everything else inbetween. At 90 degrees, there will be more or less no interference really.
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Reply 22 of 24 (Originally posted on: 07-11-03 01:13:54 PM)
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jesus got it just right,
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Reply 23 of 24 (Originally posted on: 07-13-03 09:24:24 PM)
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Quoted from Raven:
Quoted from peach:
light always, always travels in straight lines... i *did* take physics.


EXCEPT:

when passing close to a blackhole...then light WILL bend, seeing that this is how we find blackholes...

when passing through anything that causes resistance to the speed of light such as the glass in a prism, water...that is how we see rainbows and can separate the color spectrum...if light didn't bend, we couldn't do this

See reply #18, bottom section.
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Reply 24 of 24 (Originally posted on: 07-17-03 12:05:04 AM)
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Well, technically the light still travels a null geodesic, and so it is still staight as defined by the light's metric.
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