MHT CET 2026 Physics question
In a Fraunhofer diffraction of a single slit, when a slit is illuminated by a light of wavelength , angular width of central maximum is measured. When the slit is illuminated by light of another wavelength '' the angular width decreases by 25%. The value of in units is
Answer: (C)
Solution
Angular width of the central maximum in single-slit diffraction is , so for the same slit it is directly proportional to the wavelength. A 25% decrease in angular width means the new width is 75% of the old one, hence $λ = 0.75
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