Quote:
Originally Posted by idunno
Note, n = 1 in a vacuum and n > 1 in a transparent substance, where n is the index of refraction.
When a beam of light crosses the boundary between a vacuum and another medium, or between two different media, the wavelength of the light changes, but the frequency remains constant. If the beam of light is not orthogonal (or rather normal) to the boundary, the change in wavelength results in a change in the direction of the beam. This change of direction is known as refraction.
The refractive quality of lenses is frequently used to manipulate light in order to change the apparent size of images. Magnifying glasses, spectacles, contact lenses, microscopes and refracting telescopes are all examples of this manipulation.
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I believed I mentioned DISREGARDING REFRACTION. But it's too late now. YOU got PWNED.