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optical_illusions1

optical_illusions1 - Optical Illusions Types of Illusions...

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Optical Illusions
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Types of Illusions Distortions due to strange physical conditions mirages, rainbows Strange projection effects “3D”, holograms Quirks of human physiology Color perception, wiggling lines
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Refraction Light slows down going through a medium Speed depends on properties of medium Waves bend at a surface From Wikipedia: Huygens-Fresnel principle QuickTimeª and a decompressor are needed to see this picture. Faster (fewer interactions) Slower (more interactions)
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Hot air is less dense QuickTimeª and a decompressor are needed to see this picture. Less dense means fewer interactions with light => Light moves faster
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Highway/ desert mirage Looks like water reflecting things in the background QuickTimeª and a decompressor are needed to see this picture. QuickTimeª and a decompressor are needed to see this picture.
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Or the surface air can be denser… Bending happens the other way Stuff from below the horizon gets pulled up where you can see it QuickTimeª and a decompressor are needed to see this picture.
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Or the surface air can be denser… Bending happens the other way Stuff from below the horizon gets pulled up where you can see it QuickTimeª and a decompressor are needed to see this picture.
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Or the air can have water droplets in it Light refracts when it enters water droplet It reflects off back wall Light refracts when it comes out QuickTimeª and a decompressor are needed to see this picture.
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Rainbows Need sun behind you Light is refracted, reflected, refracted back at you Different refraction properties disperse colors QuickTimeª and a decompressor are needed to see this picture.
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Secondary rainbows Extra bounce means that colors get reflected: red is on bottom, blue on top QuickTimeª and a decompressor are needed to see this picture.
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