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Intensity Amplitude Relationship

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in a single slit diffraction light of wavelength 6000 A is used and the screen is 50 cm away from slit . if distance between the first and third minima is 3mm , then width of the slit is (1) 0.15 mm (2) 0.20 mm (3) 0.25 mm (4) 0.3 mm

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