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Q1. What is the width of a slit for which the distance between two first order minima is 1 cm? The slit is illuminated by a helium neon laser(wavelength=700nm). The distance between the slit and viewing screen is 4m.

Q2. A laser beam with wavelength 500nm is incident on two slits 0.1 mm apart. The interferance pattern is observed on a screen 1 m away from the plane of the slits. Determine the number of maxima on the screen within an interval 9.5mm.

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