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"The Purple People Eater" tells how a strange creature (described as a "one-eyed, one-horned, flying, purple people eater") descends to Earth because it wants to be in a rock 'n' roll band. The premise of the song came from a joke told by the child of a friend of Wooley's; Wooley finished composing it within an hour. [5]
1984 – Herman Brood, on The Brood (as "Eyes") 1987 – Mood Six, "I Saw the Light" (a video for the song was shown on MTV's 120 Minutes) 1989 – Workshy, on The Golden Mile. 1997 – Terry Hall, Laugh (released as a single) 1997 – Lori Carson, on Everything I Touch Runs Wild; 1998 – Hal Ketchum. This version reached No. 36 on the US ...
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By definition, visible light is the part of the EM spectrum the human eye is the most sensitive to. Visible light (and near-infrared light) is typically absorbed and emitted by electrons in molecules and atoms that move from one energy level to another. This action allows the chemical mechanisms that underlie human vision and plant photosynthesis.
The size of the pupil, which controls the amount of light entering the eye, is adjusted by the iris' dilator and sphincter muscles. Light energy enters the eye through the cornea, through the pupil and then through the lens. The lens shape is changed for near focus (accommodation) and is controlled by the ciliary muscle.
The dashed orange line is for a 53 year old eye, and dotted for a 75 year old eye, indicating the effect of lens yellowing.) Before reaching the retina, light must first transmit through the cornea and lens. UVB light (< 315 nm) is filtered mostly by the cornea, and UVA light (315–400 nm) is filtered mostly by the lens. [18]
Figs 2 larva after 1st moult 2a, 2b, 2c larva after 4th moult 2d, 2e, 2f, 2g, 2h, 2i after 5th moult in different positions 2j pupa front view and side view Caterpillar of purple emperor Purple emperors (Apatura iris) and lesser purple emperors (Apatura ilia) sucking moisture from the body of a dead European brown frog (Rana temporaria) in Ukraine.
The Young-Helmholtz trichromatic theory of color vision postulated that there were three types of photoreceptors in the eye, each sensitive to a particular range of visible light: short-wavelength cones, medium-wavelength cones, and long-wavelength cones. Trichromatic theory, however, cannot explain all afterimage phenomena.
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