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  2. Impossible color - Wikipedia

    en.wikipedia.org/wiki/Impossible_color

    Light of any wavelength that interacts with M cones also interacts with S or L cones, or both, to some extent. Therefore, no wavelength and no spectral power distribution excites only one sort of cone. If, for example, M cones could be excited alone, this would make the brain see an imaginary color greener than any physically possible green.

  3. Phosphene - Wikipedia

    en.wikipedia.org/wiki/Phosphene

    An artist's representation of how some people may see phosphenes by retinal stimulation. A phosphene is the phenomenon of seeing light without light entering the eye. The word phosphene comes from the Greek words phos (light) and phainein (to show). Phosphenes that are induced by movement or sound may be associated with optic neuritis. [1] [2]

  4. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    While allowing UV light to reach the retina can lead to retinal damage, the short lifespan of mice compared with other mammals may minimize this disadvantage relative to the advantage of UV vision. [31] Dogs have two cone opsins at 429 nm and 555 nm, so see almost the entire visible spectrum of humans, despite being dichromatic. [32]

  5. Darkness - Wikipedia

    en.wikipedia.org/wiki/Darkness

    The Creation of Light by Gustave Doré. Darkness is the condition resulting from a lack of illumination, or an absence of visible light.. Human vision is unable to distinguish colors in conditions of very low luminance because the hue-sensitive photoreceptor cells on the retina are inactive when light levels are insufficient, in the range of visual perception referred to as scotopic vision.

  6. Color vision - Wikipedia

    en.wikipedia.org/wiki/Color_vision

    The light spectrum is a line on which violet is one end and the other is red, and yet we see hues of purple that connect those two colors. Impossible colors are a combination of cone responses that cannot be naturally produced. For example, medium cones cannot be activated completely on their own; if they were, we would see a 'hyper-green' color.

  7. Phosphorescence - Wikipedia

    en.wikipedia.org/wiki/Phosphorescence

    Therefore, they can be used in absolute dark environments for several hours after having been exposed to bright light. A common use of phosphorescence is decoration. Stars made of glow-in-the-dark plastic are placed on walls, ceilings, or hanging from strings make a room look like the night sky. [ 29 ]

  8. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    A transparency of 50 percent is enough to make an animal invisible to a predator such as cod at a depth of 650 metres (2,130 ft); better transparency is required for invisibility in shallower water, where the light is brighter and predators can see better. For example, a cod can see prey that are 98 percent transparent in optimal lighting in ...

  9. Underwater vision - Wikipedia

    en.wikipedia.org/wiki/Underwater_vision

    Scuba diver with bifocal lenses fitted to a mask. Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors.. Underwater, objects are less visible because of lower levels of natural illumination caused by rapid attenuation of light with distance passed through

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