| Topic: |
Science > Physics |
| User: |
"rAgAv" |
| Date: |
27 May 2007 12:19:02 PM |
| Object: |
change in direction of the path of light |
Hello,
We all know the simple fact that when light enter from a rarer medium
into a denser medium, it bends towards the normal; but why? Can anyone
explain this at subatomic level?
Regards.
--
rAgAv
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| User: "Androcles" |
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| Title: Re: change in direction of the path of light |
27 May 2007 02:08:04 PM |
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"rAgAv" <ragav.payne@googlemail.com> wrote in message
news:1180286342.389070.32280@i13g2000prf.googlegroups.com...
: Hello,
:
: We all know the simple fact that when light enter from a rarer medium
: into a denser medium, it bends towards the normal; but why? Can anyone
: explain this at subatomic level?
:
:
:
: Regards.
: --
: rAgAv
Parade ground physics, instant velocity change at the boundary.
When the sergeant-major shouts "left wheel" the rank stops at the
left and accelerates on the right.
The "inside soldier" marks time while turning, and the rest of the front
line (rank) moves round by 90 degrees.
With light, of course, the "parade ground" material has rows of atoms
which channel where the light will go. Each frequency has its own
angle, as we expect:
http://www.juliantrubin.com/bigten/bigtenimages/prism1.gif
The somewhat irregular arrangement of glass or water will block
the light more so than diamond which has a regular array, which
you can observe with thick glass or the bottom of the ocean.
Thick diamonds are harder to come by, but coal is plentiful and
the same stuff, carbon. It is the arrangement of atoms that determines
transparency, and that depends also on the frequency.
See extinction, crystallography.
Some materials have more than one angle - see birefringement.
Light will pass through thin metal as we know from half-silvered
mirrors.
The reverse happens as the light leaves the opposite boundary.
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| User: "The Ghost In The Machine" |
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| Title: Re: change in direction of the path of light |
27 May 2007 01:05:15 PM |
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In sci.physics, rAgAv
<ragav.payne@googlemail.com>
wrote
on 27 May 2007 10:19:02 -0700
<1180286342.389070.32280@i13g2000prf.googlegroups.com>:
Hello,
We all know the simple fact that when light enter from a rarer medium
into a denser medium, it bends towards the normal; but why? Can anyone
explain this at subatomic level?
Not sure how detailed one wants. I can only give the basics; the light
slows down as it enters the denser medium, and its path is bent in
accordance with Snell's Law because of this slowdown.
Someone else mentioned electric dipoles to model this
refraction/slowdown. I frankly don't know the details.
Regards.
--
rAgAv
--
#191,
Linux makes one use one's mind.
Windows just messes with one's head.
--
Posted via a free Usenet account from http://www.teranews.com
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| User: "tj Frazir" |
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| Title: Re: change in direction of the path of light |
28 May 2007 10:50:22 AM |
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Light NEVER slows down ghost.
Electrons photons nuetrons all orbit at c.
It cant speed up or slow down.
Thats why it changes directions.
Photon falls into orbit because it cant slow down and falls out of orbit
because it cant speed up.
It changed directions to remain at the same speed.
A dence object is a bigger atom to orbit and energy reacts with energy
a c so the TIME point wount be at the same eject point deg in the orbit.
Photons dont slow down , the orbital path is just a billon times wider.
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| User: "Edward Green" |
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| Title: Re: change in direction of the path of light |
28 May 2007 10:34:03 AM |
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On May 27, 2:05 pm, The Ghost In The Machine
<e...@sirius.tg00suus7038.net> wrote:
In sci.physics, rAgAv
<ragav.pa...@googlemail.com>
wrote
on 27 May 2007 10:19:02 -0700
<1180286342.389070.32...@i13g2000prf.googlegroups.com>:
Hello,
We all know the simple fact that when light enter from a rarer medium
into a denser medium, it bends towards the normal; but why? Can anyone
explain this at subatomic level?
Not sure how detailed one wants. I can only give the basics; the light
slows down as it enters the denser medium, and its path is bent in
accordance with Snell's Law because of this slowdown.
Someone else mentioned electric dipoles to model this
refraction/slowdown. I frankly don't know the details.
My two bits:
Surfaces of equal phase must conincide at the interface. The closer
the incidence angle to normal, the faster a surface of constant face
moves across the interface. Therefore the medium with the slower
speed must have the direction of propagation of plane waves closer to
the normal.
That at least serves as a mnemonic. How light "knows" how to achieve
this on a microscopic level is another question. I'd go with
something like Huygen's principle: presumably if we propagate a wave
packet across the interface, interference will magically take care of
the details.
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| User: "tj Frazir" |
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| Title: Re: change in direction of the path of light |
28 May 2007 11:29:48 AM |
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A nuerton is a truck and a proton a ship in a orbit 20 miles wide .
The electron is a cup 60 miles out the orbit 120 miles wide,
The photon is a bug and will orbit a very small amount of G ,,like th
electron in orbit .
It changed directions and fell into the obit around the center of G of
the atom .
Then the G of the electron got near it beause its out in that 60 mile
orbit .
EVRYTHING is going c the same speed.
But thats the nutron going past 360 deg point 10000 times when the
electron orbits once 360.
TIME is not enouph to react.
Evrything reacts at c because energ eacts with energy at c so the
electron cant react with the nuerton in time.
In time the photon can react with the electron .
The electron is in an orbit near the time the photon is .
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| User: "tj Frazir" |
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| Title: Re: change in direction of the path of light |
28 May 2007 11:16:31 AM |
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some of you think light can slow down to 60 mph in salt.
It never slows down.
Its path might be orbits a trillion times larger.
Or the mass may heat up befor ejecting a photon as in the salt as one
atom charges up the next .
Some of you think any of the parts of atoms change speed is just wrong.
They all orbit at c around G.
time its self is bent twards G .
TIME is not the same for the nuetron and the photon . The nuerton
overlaps time its self.
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