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What is refractive index ?...

What is refractive index ?

Text Solution

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The ratio of speed of light in vacuum to the speed of light in a medium is defined as refractuve 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))

    A magician during a show makes a glass lens with n = 1.47 disappear in a through of liquid. What is the refractive index of the liquid ? Could the liquid be water ?

    The speed of light in air is 3 xx 10^(8) ms^(-1) and in glass it is 2 xx 10^(8) ms^(-1) . What is the refractive index of glass ?

    The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm. If focal length is 12 cm. What is the refractive index of glass?

    The speed of light in air is 3 xx 10^(8) ms^(-1) and in glass it is 2 xx 10^(8) ms^(-1) . What is the refractive index of glass ?

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