Question:
Two sources give an interference pattern observed on a screen distance D away. The fringe width is 2W. If D is doubled, the fringe width will:
Two sources give an interference pattern observed on a screen distance D away. The fringe width is 2W. If D is doubled, the fringe width will:
Show Hint
Fringe width is directly proportional to screen distance D.
Updated On: Apr 16, 2026
- become W/2
- remains the same
- become W
- become 4W
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Fringe width $β = \fracλ Dd$.
Step 2: If D is doubled, $β$ becomes $2β = 4W$ (since original $β = 2W$).
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