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Dispersion is caused by refraction and n...

Dispersion is caused by refraction and not by reflection. Why?

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White light is composed of seven colours having different wavelengths. And speed of different colours is the same in vacuum/air while in different media it is different.
Now, for a given angle of incidence, the angle of reflection is the same for all the wavelengths of white light, while the angle of refraction is different for different wavelengths.
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Consider the situation in figure. The bottom of the pot is reflecting plane mirror , S is small fish is a human eye . Refractive index of water is mu . Fish can see two images of human eye , first due to refractive only and other due to refraction and than reflection . Distance of these images from fish are S_(1) "and" S_(2) respectively . Human eye can also see the two images of fish, first due to refraction only and other due to reflection and then refraction . Distance of these images from human eye are S_(3) "and" S_(4) respectively . Match the quantities of column-I (with their value in column-(II) {:("Column I","Column II"),((A) S_(1),(p)H[1 + (1)/(2mu)]),((B)S_(2),(q) H[mu + (1)/(2)]),((C)S_(3) , (r) H[1 + (3)/(2mu)]) , ((D) S_(4) , (s) H[mu + (3)/(2)]):}

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Knowledge Check

  • In polarisation by reflection of light angle between reflected light and refracted light is

    A
    `pi`
    B
    `(pi)/(2)`
    C
    `2pi`
    D
    `(pi)/(4)`

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