AIIMS 2019 Physics Dispersion of Light Assertion Reason Question
Assertion: Dispersion of light occurs because velocity of light in a material depends upon its colour.
Reason: The dispersive power depends only upon the material of the prism, not upon the refractive angle of the prism.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Option B is correct because the assertion accurately states that dispersion of light occurs due to refraction, which is governed by Snell's law, and is indeed true. The reason is also true, as the dispersive power of a prism depends on its material, but it does not explain why dispersion occurs; rather, it describes a property of the prism itself. Option A is incorrect because the reason does not provide a correct explanation for the assertion. Options C and D are incorrect as both the assertion and reason are true statements. Understanding that dispersion is a result of varying refractive indices for different wavelengths of light helps clarify these concepts.
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