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Why do different colours deviate through...

Why do different colours deviate through different angles on passing through a prism ?

Text Solution

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This is because different colours travel through glass with different speeds, and glass has different refractive index for different colours.
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In the figure given below, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum XY on the screen. (i) Name the phenomenon. (ii) State the colours seen at X and Y. (iii) Why do different colours of white light bend at different angles through a prism ?

Which colour deviates (i) most (ii) least on passing through a prism ?

Knowledge Check

  • Statement I : White light gets dispersed when passed through a prism. Statement II: Different colours are deviated through different angles due to which white light splits.

    A
    If both Statement- I and Statement- II are true, and Statement - II is the correct explanation of Statement– I.
    B
    If both Statement - I and Statement-II are true but Statement - II is not the correct explanation of Statement – I.
    C
    If Statement-I is true but Statement-II is false.
    D
    If Statement-I is false but Statement-II is true.

  • Which colour suffers least deviation on passing through a prism?

    A
    Blue
    B
    Red
    C
    White
    D
    Violet

    • Similar Questions

    Explore conceptually related problems

    In the given figure, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism it produces a spectrum XY on a screen. (a) State the colour seen at X and Y. (b) Why do different colours of white light bend through different angles with respect to the incident beam of light?

    In the given figure, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism it produces a spectrum XY on a screen. (a) State the colour seen at X and Y. (b) Why do different colours of white light bend through different angles with respect to the incident beam of light?

    A narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a specturm XY on a screen. (a) State the colour seen at X and Y . (b) Why do different colours of white light bend through different angles with respect to the incident beam of light ? .

    In the figure given alongside, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum YX on the screen. (a) State the colour seen (i) at X, and (ii) at Y. (b) Why do different colours of white light bend through different angles with respect to the incident beam of light ?

    Why do different rays deviate differently in the prism?

    What is angle of deviation through a prism ?

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