I can see minute internal molecules/particles in air with my NAKED EYES. what I do?

Discussion in 'General Science & Technology' started by Golden_eyes, May 27, 2008.

  1. James R Just this guy, you know? Staff Member

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    36,484
    exchemist:
    Yes. The red and green cones have quite a large degree of overlap in their frequency sensitivities, which is one reason why red-green colour blindness is the most common kind. The blue cones peak a bit further away frequency-wise (or wavelength-wise).
    Yellow light does have an actual frequency, somewhere between green and red light. But, as you said, our perception of every frequency depends on how strongly each type of colour cone responds to the incoming light. That means we can, for example, create a perception of yellow by mixing appropriate amounts of green and red light, for instance, rather than using actual yellow light.

    In fact, this is why computer displays (LEDs, even old-fashioned phosphor screens) only need three colours for each pixel (RGB). By varying the intensities of the three channels, we can produce a sensory experience indistinguishable (to us) from using a frequency of light somewhere between the peak values of the RGB emitters. It's interesting to think about how a creature with more sophisticated colour vision would perceive our RGB screens. They would not think that they reproduce all colours accurately, for instance.
     
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  3. DaveC426913 Valued Senior Member

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    I wonder if it is possible to distinguish between a red-green yellow and spectral yellow.

    I'll bet it's pathological. The demonstrator might set it up so that it's imperceptible to him, only to have the first demonstratee come along and say they look different.



    And those creatures can even be human.

    Tetrachromats can perceive a much finer distinction in the blue-green range than the rest of us.
    One tetrachromat (they're mostly women) would constantly find herself amazed at how badly some people mismatch colours in clothing - seeing a green clashing with a blue-green where the rest of us can see no difference.
     
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