Define absolute refractive index. write its formula.
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DEFINITION
- Absolute refractive index is the refractive index of a medium in vacuum.
- It is always greater than one
FORMULA
- More specifically, it is the ratio of the spped of light in vacuum to the speed of light in that medium.
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The ratio of speed of light in vaccum to the that in the given medium
Absolute refractive index = 3 × 10 ^ 8 ÷ speed of light in the given medium.
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