MHT CET 2022 Physics question
A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern, the phase difference between the rays coming from the edges of the slit is
Answer: (D)
Solution
For a single slit of width , the path difference between the rays from the two edges at angle is . The first minimum (the first dark fringe) occurs when , so the path difference between the edge rays is one wavelength and the phase difference is
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