β = λD/d. New β' = (2λ)D/(d/2) = 4λD/d = 4β
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JEE Main 2026 — Physics Optics
medium
mcq
2026
Official previous-year question
Verified 30 May 2026.
Question
In Young's double slit experiment, the fringe width is β. If the wavelength of light is doubled and the slit separation is halved, the new fringe width is:
Options
- A
β
- B
2β
- C
4β
- D
β/2
Solution
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