When white light passes through a dispersive medium, it breaks up into various colours. Which of the following is true?

Velocity of light for violet is greater than the velocity of light for red colour

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Velocity of light for violet is less than the velocity of light for red

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Velocity of light is the same for all colours

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Frequency of light is different for different colours

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Solution

The correct option is B Velocity of light for violet is less than the velocity of light for red
When white light passes through a dispersive medium it breaks up into various colours because velocity of light for different colours is different as they differ in wavelength. Secondly, velocity of light for violet is less than the velocity of light for red, as it undergoes maximum deviation

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