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Explain Relative refractive index and Absolute refractive index. OR Write a short note on refractive index.

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The refractive index is the ratio between the speed in vacuum to the speed in the medium.It gives us the idea that how the light can pass in the medium.
The relative refractive index is defined as a ratio of speed of light in one medium to speed of light in other medium.
The Absolute refractive index is defined as the ratio between speed of light in vacuum to the speed of light in the medium.
Final Answer:
The refractive index is the ratio between the speed in vacuum to the speed in the medium.It gives us the idea that how the light can pass in the medium.
The relative refractive index is defined as a ratio of speed of light in one medium to speed of light in other medium.
The Absolute refractive index is defined as the ratio between speed of light in vacuum to the speed of light in the medium.

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