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Wherever n is a constant for just about any two products in addition to a specified colour of light. If the first materials is air or vacuum, n would be the refractive index of the second substance. Geometrical optics, or ray optics, describes the propagation of light concerning "rays" which https://eyeglassesnearme94692.livebloggs.com/36109174/bookshelf-speakers-no-further-a-mystery

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