A famous perceptual illusion in which the brain switches between seeing a teen and an old woman (or “wife” and “mother in law”). An anonymous German postcard
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A m lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed focal length (FFL) lens
Sources. Van Walree’s webpage on vignetting uses some unorthodox terminology but illustrates very well the physics and optics of mechanical and optical vignetting.
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Creating optical illusions is an art in itself. And portraying an optical illusion into an aesthetically pleasing work of art requires a fair bit of sense and
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Bobbi Brown is the first beauty expert with a signature line of eyewear. Her goal in designing her eyewear collection is to teach women how to select frames that
The Blind Spot One of the most dramatic experiments to perform is the demonstration of the blind spot. The blind spot is the area on the retina without receptors that