Physics
Assertion (A): A beam of white light gives a spectrum on passing through a hollow prism.
Reason (R): The speed of light outside the prism is same as the speed of light inside the prism.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.
Spectrum
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Answer
Both A and R are true and R is not the correct explanation of A.
Explanation
Assertion (A) is false. A beam of white light does give a spectrum when passing through a prism, but it is not a "hollow" prism that causes this dispersion. A hollow prism contains air in it, so when a beam of white light is passed through it, it does not give a spectrum. Because light is passed to air through air, so no spectrum will be produced.
Reason (R) is false. The speed of light inside a medium, such as a glass prism, is generally slower than the speed of light in vacuum. So the speed of light outside the prism is greater than the speed of light inside the glass prism.
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