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The index of refraction for a material is a measure of how much the speed of light, which travels through that material, is reduced compared with the speed of light in vacuum. Titanium dioxide, a white, opaque, naturally occurring mineral used in many products, possesses a relatively high index of refraction. Its refractive index varies with the light wavelength and the specific crystal form; for anatase, it can be around 2.49, while for rutile, it's approximately 2.90. This value signifies that light travels roughly 2.5 to 2.9 times slower in titanium dioxide than it does in a vacuum.
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