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What is refractive index ?...

What is refractive index ?

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The ratio of speed of light in vacuum to the speed of light in a medium is defined as refractive index `'mu'` of that medium.
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Knowledge Check

  • Why is refractive index in a transparent medium greater that one?

    A
    Because the speed of light in vacuum is always less that speed in a transparent medium.
    B
    Because the speed of light in vacuum is always greater than the speed in a transparent medium.
    C
    Frequency of wave changes when it crosses medium
    D
    None of these.

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    A light ray is incident on air-liquid interface at 45^@ and is refracted at 30^@. What is the refractive index of the liquud? For what angle of incidence will the angle between reflected ray and refracted ray be 90^@? (AS_(7))

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