CUET · PHYSICS · PYQ PAPER 2025
In a double slit experiment, if the distance between the slits be reduced to half, then the new fringe width will be
- A the same
- B doubled
- C halved
- D one-fourth
Answer & Solution
Correct Answer
(B) doubled
Step-by-step Solution
Detailed explanation
Fringe width \(\beta = \frac{\lambda D}{d}\) New slit distance \(d' = d/2\) New fringe width \(\beta' = \frac{\lambda D}{d'} = \frac{\lambda D}{d/2} = 2 \frac{\lambda D}{d} = 2\beta\) The new fringe width will be doubled.
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