An optician wishes to determine the wavelength of the light in a laser beam. To do so, she directs the beam toward a partition with two tiny slits separated by 0.180 mm . An interference pattern appears on a screen that lies 5.15 m from the slit pair. The optician's measurements show that two adjacent bright interference fringes lie 1.57 cm apart on the screen. What is the laser's wavelength (in nm) ?
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nm