Assertion: A beam of white light gives a spectrum on passing through a hollow prism.
Reason: Speed of light outside the prism is different from the speed of light inside the glass prism.

Both assertion and reason are correct and reason is the correct explanation of the assertion

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Both assertion and reason are correct, but reason is not the correct explanation of the assertion

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Assertion is correct, but reason is incorrect.

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Assertion is incorrect, but reason is correct.

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Both assertion and reason are incorrect.

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Solution

The correct option is D Assertion is incorrect, but reason is correct.
A beam of white light does not give spectrum on passing through a hollow prism. This is because dispersion of light cannot occur on passing through air contained in a hollow prism. Dispersion takes place because refractive index of a medium for different colour is different. When white light travels from air to air, refractive index remains same and no dispersion occurs.Speed of light outside the prism is more than inside in case of normal prism which is not hollow.

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Assertion: A beam of white light gives a spectrum on passing through a hollow prism.Reason: Speed of light outside the prism is different from the speed of light inside the glass prism.

Assertion: A beam of white light gives a spectrum on passing through a hollow prism.
Reason: Speed of light outside the prism is different from the speed of light inside the glass prism.