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Richard Feynman Talks About Light

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[Richard Feynman Talks About Light]

[Richard Phillips Feynman (May 11, 1918 – February 15, 1988):] Source: LYBIO.net
If I’m sitting next to a swimming pool, and somebody dives in – and she’s not too pretty, so I can think of something else – I think of the waves and these things that have formed in the water. And, that, when there’s lots of people have dived in the pool there’s a very great choppiness of all these waves all over the water and to think that it’s possible, maybe, that in those waves there’s a clue as to what’s happening in the pool. That some sort of insect or something with sufficient cleverness could sit in the corner of the pool and just be disturbed by the waves, and by the nature of the irregularities and bumping of the waves have figured out who jumped in where and when and where what’s happening all over the pool. And that’s what we’re doing when we’re looking at something. Uh, the light that comes out is … is waves, just like in the swimming pool except in three dimensions instead of the two dimensions of the pool it’s they’re going in all directions. And we have a eighth of an inch black hole into which these things go … which, is particularly sensitive to the parts of the waves that are coming in a particular direction it’s not particularly sensitive when they’re coming in at the wrong angle which we say is from the corner of our eye. And if we want to get more information from the corner of our eye we swivel this ball about so that the hole moves from place to place. Then … uh, it’s quite wonderful that we see … figure out so easy. That’s really because the light waves are easier than the … the waves in the water are a little bit more complicated it would have been harder for the bug than for us but it’s the same idea. To figure out what the thing is that we’re looking at at a distance.

And it is kind of incredible, because when I am looking at you, someone standing to my left could see somebody who is standing on my right, and that the light can go right across these waves, the waves that are going this way (show up and down), id. (Front/back). It is just a complete network.

Now it’s easy to think of them as arrows passing each other, but that’s not the way it is, because all of this is something shaking (it is called the electric field), but we don’t have to bother with what it is. It is just like the water height that is going up and down. So some quantities are shaking about here, and the combination of the motion that is so elaborate and complicated then that results in what make me see you. And at the same time, completely undisturbed by the fact that there influences represent the other guy seeing the other on this side.

So that this is a TREMENDOUS MESS of waves, all over in space, which we call – which is the the light bouncing around the room, and going from one thing to the other, because of course most of the room doesn’t have one-eighth inch black holes: it is not interested in that light, but the light is there anyway: it bounces of it, it bounces of that, and all of this is going on, and yet we can sort it out when this instrument (Feynman shows his eye).

But besides all that, these little waves I was talking about in the water, maybe they are so some of them and then you can have slower swashes which are longer and shorter, perhaps that animal who it’s study only uses waves between this length and that length, so it turns out that the eye is only using waves between this length and that length, except that those two lengths are hundred (millions) hundred thousandths of an inch. (100,000’th of an inch).

And what about the slowest swashed, the waves that go more slowly that happen to have the longer distance between crest to trough.

Those represent heat. We feel those, but our eyes don’t see them focused very well; we don’t see them in fact at all. The shorter wave is blue, the longer wave (as you know) is red, but when it gets longer that that – we call it infrared. All of these is in there at the same time; that’s the heat. Pit viper that get down here in the desert, they have a very little thing (F. shows a hole) so that they can see longer waves, and pick up mice, which are radiating their heat in the longer waves (but their body heat) by looking at them with this eye, which is the pit of the pit viper.

But we can’t, we are not able to do that. And the these waves get longer and longer, and (all through the same space, all of this things are going on at the same time), so that in this space there is not only (your) my vision of you, but also information from from Moscow Radio that’s being broadcasted at present moment, and the seeing of somebody from Peru!

All the radio waves are just the same kind of waves, only they are longer waves. And there’s the radar, from the airplane which is looking at the ground to figure out where it is, which is coming through this room at the same time.

[Richard Feynman:] Source: LYBIO.net
Plus the X-rays, and cosmic rays, and all these other things, which are the same kind of waves – exactly the same waves- but shorter, faster, or longer, slower.

It’s exactly the same thing, so this big field, this – this area of irregular motions of this electric field, this vibration, contains this tremendous information, and it’s ALL REALLY there, that’s what gets you.

If you don’t believe it, then you pick a piece of wire and connect it to a box and in the wire the electrons would be pushed back and forth by this electric field, swashing just at the right speed for the certain kind of long waves, and you turn some knobs on the box to get the swashing just right, and you hear Radio Moscow!

[Richard Feynman:] Source: LYBIO.net
Then you know that it was there. How else did it get there? It was there all the time. It is only when you turn on the radio that you notice it. But that all these things are going through the room at the same time which everybody knows, but you gotta stop and think about it to really get the pleasure about the complexity – the INCONCEIVABLE nature of nature.

Richard Feynman Talks About Light. It was there all the time. It is only when you turn on the radio that you notice it. Complete Full Transcript, Dialogue, Remarks, Saying, Quotes, Words And Text.