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Refractive Index

Define absolu...

Question

Define absolute refractive index of a medium.

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Solution

The absolute refractive index is the refractive index of a medium in vacuum.

More specifically, it is the ratio of the speed of light in vacuum to the speed of light in that medium.

It is always greater than one.

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Q. Define absolute refractive index of a medium and relative refractive index.

Q. What happens to the speed of light when it undergoes refraction in a medium ? Hence define absolute refractive index of a medium.

v_{1}, v_{2}

and c represent the speed of light in medium 1, medium 2, and vacuum respectively , write the expressions for
(a) absolute refractive index of medium 1
(b) absolute refractive index of medium 2
Hence show that

_{1} n_{2} = \frac{n_{2}}{n_{1}}

Q. If absolute refractive index of a medium is 1.5, what is the speed of light in that medium?

Q. State the relation between the critical angle and the absolute refractive index of a medium.

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