Definition of refractive index
: the ratio of the speed of radiation (such as light) in one medium (such as air, glass, or a vacuum) to that in another medium
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As light passes through the glass, its frequency is changed by the periodic changes in refractive index.
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First Known Use of refractive index
1839
Medical Dictionary
Learn More about refractive index
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Britannica.com: Encyclopedia article about refractive index
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