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Use "refractive" in a sentence
"A fundamental property called the refractive index governs the amount of light a material reflects, as well as other optical properties such as diffraction, refraction, and the speed of light inside the material."
"At the height of the cold war, a Russian named Victor Veselago took a close look at something called the refractive index."
"The material property which changes the speed of light in a material for a particular frequency is called refractive index."