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MHT CET Physics question

PhysicsWave OpticsMHT CET

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

At the first diffraction minimum , so the path difference between the edge rays is and the phase difference is

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Question ID VK-077346