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post #1 of 19 (permalink) Old 07-31-2008, 12:38 PM Thread Starter
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Any physicists?? ...or maybe philosophers

So i noticed something and was wondering if anyone knows why this happens...


A laser light:

If you shine a light produced by a laser onto a dark object, the light isnt bright, because the dark colors absorb light, a white object giving the brightest look to the laser light because it reflects the light.

well.... why is it that if you shine a laser onto a object at one point on that object, it is a certain brightness, but if you shine it onto a shadow that is cast onto that same object the light brightness stays the same? shouldnt it be less bright since the shadow is darker??
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post #2 of 19 (permalink) Old 07-31-2008, 12:41 PM
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post #3 of 19 (permalink) Old 07-31-2008, 12:44 PM
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post #4 of 19 (permalink) Old 07-31-2008, 12:46 PM Thread Starter
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i think i figured it out.
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post #5 of 19 (permalink) Old 07-31-2008, 12:55 PM
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Quote:
Originally Posted by musto View Post
...

A laser light:

If you shine a light produced by a laser onto a dark object, the light isnt bright, because the dark colors absorb light, a white object giving the brightest look to the laser light because it reflects the light.

well.... why is it that if you shine a laser onto a object at one point on that object, it is a certain brightness, but if you shine it onto a shadow that is cast onto that same object the light brightness stays the same? shouldnt it be less bright since the shadow is darker??


No, because the material (object) your shining the light onto has the same reflective properties regardless of weather it's in the dark (shaded) or in an unshaded area of the material/object.

This is assuming the object surface is uniform across and there is no change in the angle of incidence across the material.

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post #6 of 19 (permalink) Old 07-31-2008, 12:56 PM
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i think i figured it out.
What did you come up with?

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post #7 of 19 (permalink) Old 07-31-2008, 01:43 PM
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Quote:
Originally Posted by Trunk Monkey View Post
No, because the material (object) your shining the light onto has the same reflective properties regardless of weather it's in the dark (shaded) or in an unshaded area of the material/object.

This is assuming the object surface is uniform across and there is no change in the angle of incidence across the material.
yup, you pretty much got it bud


oh, and the days that philosophers could expand on man's understanding of light have looonng come and gone
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post #8 of 19 (permalink) Old 07-31-2008, 05:04 PM
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What did you come up with?
I want to hear this one too...

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post #9 of 19 (permalink) Old 07-31-2008, 05:09 PM Thread Starter
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I want to hear this one too...
the same thing they said, just because its shaded does not affect the reflective properties...
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post #10 of 19 (permalink) Old 07-31-2008, 05:31 PM
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this one wasnt nearly as confusing/interesting as the one about the "light source moving at the speed of light" thread
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post #11 of 19 (permalink) Old 07-31-2008, 10:12 PM
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this one wasnt nearly as confusing/interesting as the one about the "light source moving at the speed of light" thread
That one was pretty cool. I just did a little searching on the net, and found that it has been proven experimentally that the speed of light in a vaccum is constant and neither the velocity of the light source nor the velocity of the observer has any effect on the apparent speed of light.

With regards to the laser pointer question, it does not matter if the dot from the pointer is in shadows or on a brightly light surface, nor does it matter what the surface is composed of. My cat percieves the dot the same way. As a toy.

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post #12 of 19 (permalink) Old 07-31-2008, 11:04 PM
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Quote:
Originally Posted by Johnny Cougar View Post
That one was pretty cool. I just did a little searching on the net, and found that it has been proven experimentally that the speed of light in a vaccum is constant and neither the velocity of the light source nor the velocity of the observer has any effect on the apparent speed of light.
yup, thats what I argued over in the other thread

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nor does it matter what the surface is composed of.
where did you read this?
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post #13 of 19 (permalink) Old 07-31-2008, 11:53 PM
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Quote:
Originally Posted by Johnny Cougar View Post
That one was pretty cool. I just did a little searching on the net, and found that it has been proven experimentally that the speed of light in a vaccum is constant and neither the velocity of the light source nor the velocity of the observer has any effect on the apparent speed of light.

With regards to the laser pointer question, it does not matter if the dot from the pointer is in shadows or on a brightly light surface, nor does it matter what the surface is composed of. My cat percieves the dot the same way. As a toy.
uhhhh, what????

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post #14 of 19 (permalink) Old 07-31-2008, 11:55 PM
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what does a philosopher have to do with lasers?




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post #15 of 19 (permalink) Old 08-01-2008, 10:04 AM
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yup, thats what I argued over in the other thread



where did you read this?
Gotta read to the end to the bit about my cat and the laser pointer....

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post #16 of 19 (permalink) Old 08-01-2008, 03:06 PM
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post #17 of 19 (permalink) Old 08-01-2008, 05:24 PM
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what does a philosopher have to do with lasers?
Putting on my vaunted and illustrious philosophical guise, I find many parallels of perfunctory perception that illuminate abundant tangentially sympathetic coherence allowing and encouraging participation to those who seek enlightenment. As a philosopher is one that may expound theories in any area of profound experience.

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post #18 of 19 (permalink) Old 08-01-2008, 05:27 PM
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post #19 of 19 (permalink) Old 08-01-2008, 06:27 PM
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Can we boot this useless thread and free up some of that bandwith for other pertinent information. Everytime I try to use Search is gets bunked up over crap like this.

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