To determine the wavelength of He-Ne laser light using single slit diffraction

1. The main principle used in Interference is ____?
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2. When Two waves of same amplitude add constructively, the intensity becomes ____?
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3. How does changing the distance between the single slit and the screen affect the diffraction pattern?
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4. Which parameter primarily determines the width of the central maximum in the diffraction pattern obtained from a single slit?
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5. What is the primary cause of the diffraction pattern observed in a single-slit experiment with a He-Ne laser?
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