Your friend has been given a laser for her birthday. Unfortunately, she did not receive a manual with it and so she doesn’t know the wavelength that it emits. You help her by performing a double-slit experiment, with slits separated by 0.18 mm. You find that two adjacent bright fringes are 5.5 mm apart on a screen 1.6 m from the slits. What is the wavelength the laser emits?
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