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Question
Assertion (A): The critical angle of light passing from glass to air is minimum for violet colour.
Reason (R): The wavelength of blue light is greater than the light of other colours.
Options
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Assertion is true but Reason is false.
Both Assertion and Reason are false.
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Solution
Assertion is true but Reason is false.
Explanation:
Assertion (A) is true because the critical angle (θc) is inversely related to the refractive index (n). Since the refractive index of glass is highest for violet light (shortest wavelength), its critical angle is the smallest. Reason (R) is false because violet and blue light have the shortest wavelengths in the visible spectrum, not the longest. Therefore, the Assertion is true, but the Reason is false.
