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Stik, stylised as STIK, [1] is a British graffiti artist based in London. [ 2 ] [ 3 ] Born in 1979, with no formal art school training, Stik is known for painting large stick figures that are six-lines, and two-dot figures.
In Cartesian physics, light was the sensation of pressure emitted by surrounding objects that sought to move, as transmitted through the rotatory motion of material corpuscles. [8] These views extended to Isaac Newton's corpuscular theory of light, [9] and would be adopted by John Locke and other the 18th-century luminaries. [10]
The iris (light brown region), pupil (black circle in the centre), and sclera (white surrounding area) are visible in this image, along with the eyelids and eyelashes which protect the eye. The human eye functions by focusing light onto a layer of photoreceptor cells called the retina, which forms the inner lining of the back of the eye. The ...
The highest such number that the eye can resolve as stripes, or distinguish from a grey block, is then the measurement of visual acuity of the eye. For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD [43] (1.2 arcminute per line pair, or a 0.35 mm line pair, at 1 m).
The pupil of the human eye can range in size from 2 mm to over 8 mm to adapt to the environment. The human eye can detect a luminance from 10 −6 cd/m 2, or one millionth (0.000001) of a candela per square meter to 10 8 cd/m 2 or one hundred million (100,000,000) candelas per square meter.
The method is based on the Young–Helmholtz theory, which states that the human eye sees color using millions of intermingled cone cells of three types on its inner surface. According to the theory, one type of cone is most sensitive to the end of the spectrum called "red", another is sensitive to the middle or "green" region, and the third is ...
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The cone cells in the human eye are of three types which respond differently across the visible spectrum and the cumulative response peaks at a wavelength of around 555 nm. Therefore, two sources of light which produce the same intensity (W/m 2 ) of visible light do not necessarily appear equally bright.