Old 02-02-2010, 01:05 AM #1
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Default Why do green lasers appear brightest?

I know they do, but like...why? Why are our eyes most sensitive?


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Old 02-02-2010, 01:09 AM #2
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Default Re: Why do green lasers appear brightest?

quick search brought up this graph.

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Old 02-02-2010, 01:12 AM #3
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Default Re: Why do green lasers appear brightest?

Quote:
Originally Posted by Kaaklph View Post
I know they do, but like...why? Why are our eyes most sensitive?
Because our ancestors needed to know when the fruit was ripe

Peace,
dave
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Old 02-02-2010, 03:13 AM #4
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Default Re: Why do green lasers appear brightest?

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Because our ancestors needed to know when the fruit was ripe

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ROFL....

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Old 02-02-2010, 03:24 AM #5
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Default Re: Why do green lasers appear brightest?

Classic...
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Old 02-02-2010, 03:25 AM #6
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Default Re: Why do green lasers appear brightest?

Dave -- You're nutz.
But Nutz aren't green when ripe !

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Old 02-02-2010, 03:26 AM #7
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Default Re: Why do green lasers appear brightest?

Quote:
Originally Posted by daguin View Post
Because our ancestors needed to know when the fruit was ripe

Peace,
dave

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Old 02-02-2010, 03:36 AM #8
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Default Re: Why do green lasers appear brightest?

I think it was to find out if certain female places were safe to mate in. I wouldn't want to mate with something dripping green & yellow liquids, would YOU ?
@ The Mods, if this is over the line, please delete at your convenience, Thanks &/or sorry. rob
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Old 02-02-2010, 03:38 AM #9
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Default Re: Why do green lasers appear brightest?

Key Lime pie and honey... Sound good to me.

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Old 02-02-2010, 04:16 AM #10
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Default Re: Why do green lasers appear brightest?

@ Hemlock _Mike, strange you should mention Key Lime Pie (my favorite). I just got done with a slice. I'll have to try it with honey on it, sounds GREAT. rob
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Old 02-02-2010, 04:20 AM #11
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Default Re: Why do green lasers appear brightest?

Quote:
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Key Lime pie and honey... Sound good to me.

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MMMMmm that does sound good
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Old 02-02-2010, 07:42 AM #12
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Default Re: Why do green lasers appear brightest?

Quote:
Originally Posted by STI24 View Post
quick search brought up this graph.


Yeah I've seen this before, I was going to explain I've seen this curve...but all it does it plot sensetivity against wavelength, it doesn't actually tell me why green light is the most sensitive...
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Old 02-02-2010, 09:10 AM #13
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Default Re: Why do green lasers appear brightest?

Probably due to the fact that green is right in the middle of the "visible" spectrum, and
it only makes sense that visibility would start to tapper off towards the edges
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Old 02-02-2010, 09:22 AM #14
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Default Re: Why do green lasers appear brightest?

it seems like you want a rather specific reason of why the eye in fact is more sensitive to green, since that graph was not enough for you.
quick search on wikipedia gave alot:

A range of wavelengths of light stimulates each of these receptor
types to varying degrees. Yellowish-green light, for example,
stimulates both L and M cones equally strongly, but only
stimulates S-cones weakly. Red light, on the other hand,
stimulates L cones much more than M cones, and S cones hardly
at all; blue-green light stimulates M cones more than L cones, and
S cones a bit more strongly, and is also the peak stimulant for rod
cells; and violet light stimulates almost exclusively S-cones. The
brain combines the information from each type of receptor to
give rise to different perceptions of different wavelengths of light.

source:

en.m.wikipedia.org/wiki/Color_vision?wasRedirected=true

that link might be a mobile link... But i think searching COLOR VISION will do the trick.

Hope it helped you a bit.

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Old 02-02-2010, 09:34 AM #15
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Default Re: Why do green lasers appear brightest?

Quote:
Originally Posted by Kaaklph View Post
Yeah I've seen this before, I was going to explain I've seen this curve...but all it does it plot sensetivity against wavelength, it doesn't actually tell me why green light is the most sensitive...
Human eyes are most sensitive to green and yellow because of our Sun. This picture should explain it (look at the red graph):


You can see that the peak irradiation is around 500-600nm. Compare this to the Eye Colour Sensitivity graph.
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Old 02-02-2010, 01:11 PM #16
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Default Re: Why do green lasers appear brightest?

I've always been told that the humans have adapted their eyes to detect the best the most common wavelength. Since plants are exactly that "555nm green", we focused on that color and for this reason our eyes are more sensitive to it, and for that this is the wavelength on the middle of the visible spectrum.

This theory however, implies that probably polar bears have adapted to all colors due to the snow being white, or maybe to blue due to the sky color. This would explain why many animals can see IR wavelengths that we can't, etc...

Yours,
Albert
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