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What is refractive index ? ​
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What is refractive index ? ​

User Watzon
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Step-by-step explanation:

Refractive Index is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by the letter ‘n’ or n’ in a descriptive text and mathematical equations.

User Danylo Volokh
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refractive index of a material is a dimensionless number that describes how fast light travels through the material
User Bluecakes
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