Question

Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the codes (A), (B), (C), and (D) as given below.
Assertion (A): In double slit experiment, if one slit is closed, diffraction pattern due to the other slit will appear on the screen.
Reason (R): For interference, at least two waves are required.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Both Assertion (A) and Reason (R) are false.

Hint:

Closing one slit in a double slit experiment removes interference but allows diffraction from the open slit. Interference needs two sources; diffraction occurs even with one.

Answer 1

The Correct Option is C

In a double-slit experiment, if one slit is closed, the wave from the single open slit diffracts, creating a diffraction pattern on the screen. Thus, the assertion is true. Regarding the reason: - The statement "For interference, at least two waves are required" is true in isolation. - However, the reason must explain the assertion. - The assertion specifically concerns diffraction, not interference. - Therefore, while the reason is a valid statement, it is not relevant to the assertion and is considered false in the context of cause-and-effect explanation. Conclusion: - Assertion (A) is true. - Reason (R) is false (as an explanation for the assertion). Final answer: Option (C)