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Why is there no dispersion of light refr...

Why is there no dispersion of light refracted through a rectangular glass slab ?

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After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the direction of incedence of white light on the slab. As rays of all colours emerges in the same direction (of incidence of white light), hence there is no dispersion, but only leteral displacement.
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Why there is no dispersion of light refracted through a rectangular glass slab?

The power of a rectangular glass slab is zero .

Knowledge Check

  • Assertion : There is no dispersion of light refracted through a rectangular glass slab. Reason : Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion and reason both are false.

  • Assertion: There is no dispersion of light refracted through a rectangular glass slab. Reason : Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.

    A
    Assertion is True, Reason is True, Reason is a correct explantion for Assertion
    B
    Assertion is True, Reason is True, Reason is not a correc explanation for Assertion
    C
    Assertion is True, Reason is False
    D
    Assertion is False, Reason is False.

  • In an experiment to study the refraction of light through a rectangular glass slab, a student measured the angle of incidence, angle of refraction and the angle of emergence, The student lost the reading of angle of incidence but noted the readings of angle of refraction to be 35^(@) and angle of emergence to be 65^(@) . The angle of incidence is likely to be :

    A
    `45^(@)`
    B
    `55^(@)`
    C
    `35^(@)`
    D
    `65^(@)`

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    In an experiment to trace the path of a ray of light passing through a rectangular glass slab, angle of incidence in air was given as 60^(@) . Two students P and Q found angle of refraction as 42^(@) and 65^(@) respectively. Who is right and why?

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