In a double-slit interference experiment, what happens to the fringe separation () on the screen if the distance from the slits to the screen () is doubled?
Answer and explanation
Correct answer: C. It is doubled
- Step 1: Recall Young's double-slit fringe spacing formula: , where is slit spacing.
- Step 2: Since fringe spacing is directly proportional to screen distance , doubling doubles .
Answer
It is doubled.
Why not the others: 'It is halved' would occur if slit distance were doubled; 'Remains unchanged' is false; 'Increases four-fold' assumes a quadratic dependency.
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