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Passions in Poetry

Chasing Shadows

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Stephanos
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25 posted 11-26-2003 07:16 AM       View Profile for Stephanos   Email Stephanos   Edit/Delete Message      Find Poems   Click to visit Stephanos's Home Page   View IP for Stephanos

Pete,

But isn't the fact that a shadow is merely an absence of light enough to invalidate proposition 2?  Therefore it wouldn't matter if that light were either diffused sunlight or laser light.  I just thought that thinking in terms of a laser simplified things by eliminating other considerations.


Stephen.  
Stephanos
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26 posted 11-26-2003 07:17 AM       View Profile for Stephanos   Email Stephanos   Edit/Delete Message      Find Poems   Click to visit Stephanos's Home Page   View IP for Stephanos

Happy Thanksgiving Day to all!


Stephen.
Essorant
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27 posted 11-26-2003 10:52 AM       View Profile for Essorant   Email Essorant   Edit/Delete Message      Find Poems   Click to visit Essorant's Home Page   View IP for Essorant

"Perhaps imagining a the conifer and cardinal in a completely dark world, with a large laser beam shining down on the conifer."

If it were absolute unbending light, wouldn't it be shadowless on both sides?

[This message has been edited by Essorant (11-26-2003 11:12 AM).]

jbouder
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28 posted 11-26-2003 11:24 AM       View Profile for jbouder   Email jbouder   Edit/Delete Message      Find Poems  View IP for jbouder

Hmmm ... shooting conifers and cardinals with large laser beams ... now THAT sounds like fun.
Not A Poet
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29 posted 11-26-2003 07:05 PM       View Profile for Not A Poet   Email Not A Poet   Edit/Delete Message      Find Poems   Click to visit Not A Poet's Home Page   View IP for Not A Poet

Stephen, I thought that was what I said. I intended to anyway.

It has been a very long time since college physics and optics was not my best anyway but I don't think a laser light would be bent say by passing through a prism like ordinary light. As I recall, light is ben by a prism because it is made up of multiple wavelengths. The longer ones (red) being slowed more than the shorter ones (blue) by the change of optical density passing into then out of the prism. Gee, I think that's right. Since a laser must be a single wavelength, I don't see how it could bend.

Ok, I guess that is really a new subject, so, no more on that now.

But yes, the shadow is not a presence. It is the absence of light (or reduction of light) caused by the object between the source and the target. That, to me, invalidates proposition #2.

Hey, thanks again for making me think and try to remember old, old stuff.

Pete
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30 posted 11-26-2003 09:45 PM       View Profile for Local Rebel   Email Local Rebel   Edit/Delete Message      Find Poems  View IP for Local Rebel

Ess said
quote:

If we were to imagine each shadow as being a different colour would there be a different colour at all for this cardinal inside the conifer's shadow?  There is light inside the shadow still, so shouldn't this draw some shadow off the cardinal, and show if it were a different colour?



Stephen said
quote:

Yeah, but I think that the initial problem can be approached best by imagining absolute light and shadow, rather than sunlight.  Perhaps imagining a the conifer and cardinal in a completely dark world, with a large laser beam shining down on the conifer.  Your statements about diffusing light is interesting, but a secondary issue to the fallacy of proposition #2 isn't it?



and the answer is no... it isn't

photons will always behave as photons -- but you both are on the right track -- if Ron's apt analogy of the ocean and waves aren't cutting it for you so far try thinking of it in the terms you just presented Stephen -- the laser is a 'directional' light -- which casts the apparent shadow -- the light that would allow us to see another object -- a cardinal or -- can I suggest a Hawk? -- inside the 'shadow' is ambient or 'reflected' light.  The cardinal does, in a way, cast a shadow of ambient light inside the primary shadow which is merely undetectable because the light source is not from a single direction and cannot be less absence of light than the primary shadow

if our visual abilities were more sensitive we may be able to detect a 'negative' shadow cast by the cardinal inside the shadow -- that is to say a halo of more reflected light but our eyes wouldn't be able to notice that any more than our ears could hear a dog whistle

happy thanksgiving...
Stephanos
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31 posted 11-29-2003 09:43 PM       View Profile for Stephanos   Email Stephanos   Edit/Delete Message      Find Poems   Click to visit Stephanos's Home Page   View IP for Stephanos

LR,

thanks to you ... My headache's back.

I think I'm gonna join Jim and go blast some trees and birds with a big ray gun.  That sounds better than Thanksgiving football tossing.  

Stephen.
Not A Poet
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32 posted 12-03-2003 11:55 PM       View Profile for Not A Poet   Email Not A Poet   Edit/Delete Message      Find Poems   Click to visit Not A Poet's Home Page   View IP for Not A Poet

Sorry didn't work.

[This message has been edited by Not A Poet (12-04-2003 12:00 AM).]

 
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