Optics Question 50
Question: Assertion : No interference pattern is detected when two coherent sources are infinitely close to each other. Reason : The fringe width is inversely proportional to the distance between the two slits.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: B
Solution:
When d is negligibly small, fringe width $ \beta $ which is proportional to $ 1/d $ may become too large. Even a single fringe may occupy the whole screen. Hence the pattern cannot be detected.
