Question

In refractive index what does n 21 mean​

Answer 1

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the extent of change in direction that takes place in a given pair of media is expressed in terms of the refractive index

n21 represents refractive index of medium 2 with respect to medium 1, when light is going from medium 1 to medium 2.

for formula refer attachment

it is called absolute refractive index of the given medium


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