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The refractive quality of lenses is frequently used to manipulate light in order to change the apparent size of images.Many animals with eyes that do not require lenses (such as insects and shrimp) are able to detect ultraviolet, by quantum photon-absorption mechanisms, in much the same chemical way that humans detect visible light.Light is at once both obvious and mysterious.
450 bce) seems to have developed a model of vision in which light was emitted both by objects and the eye.Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 1011 metre to radio waves measured in metres.