4. What is Absolute refractive index?
Write its formula and units.
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The absolute refractive index. is defined as the ratio of the speed of light in vacuum and in the given medium. The absolute refractive index should never be less than 1.
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Answer:
Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v
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