Assertion: A narrow pulse of light is sent through a medium. The pulse will retain its shape as it travels through the medium. Reason: A narrow pulse is made of harmonic waves with a large range of wavelengths.A. (a) If both assertion and reason are true and reason is the correct explanation of assertion.B. (b) If both assertion and reason are true but reason is not the correct explanation of assertion.C. (c) If assertion is true but reason is false.D. (d) If assertion and reason both are false.

Assertion: A narrow pulse of light is sent through a medium. The pulse

1.	Assertion: A narrow pulse of light is sent through a medium. The pulse will retain its shape as it travels through the medium. Reason: A narrow pulse is made of harmonic waves with a large range of wavelengths.A. (a) If both assertion and reason are true and reason is the correct explanation of assertion.B. (b) If both assertion and reason are true but reason is not the correct explanation of assertion.C. (c) If assertion is true but reason is false.D. (d) If assertion and reason both are false.
Answer» Correct Answer - D A narrow pulse is made of harmonic waves with a large range of wavelength. As speed of propagation is different for different wavelengths, the pulse cannot retain its shape while travelling through the medium.

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