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Double slits of 0.115 mm separation are placed at the front of a lecture room that is 17.1 m long. The interference pattern is cast on a screen at the front by reflecting the pattern from a mirror on the back wall of the room. If the light source is a helium-neon laser (%u03BB = 633.0 nm), what is the separation between the first two bright fringes?(m)

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