MHT CET 2024 Physics question
The angular separation of the central maximum in the Fraunhofer diffraction pattern is measured. The slit is illuminated by the light of wavelength 6000 Å. If the slit illuminated by light of another wavelength, the angular separation decreases by 20%. The wavelength of light used is
Answer: (C)
Solution
The angular width of the central maximum in single-slit diffraction is , so for the same slit it is directly proportional to . A 20% decrease in angular separation means
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