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An instructor 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 0.195 mm. An interference pattern appears on a screen that lies 4.95 m from the slit pair.
The instructor's measurements show that two adjacent bright interference fringes lie 1.60 cm apart on the screen.
What is the laser's wavelength (in nm) ?
 nm
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