A laser with a wavelength of 650 nm passes through a double, Ask an Expert

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A laser with a wavelength of 650 nm passes through a double slit. A pattern is observed on a wall that is 1.5 meters away from the slits. The spacing between 10 bright fringes is measured to be 3 cm. What is the separation between the slits? Show your work. I assume the formula to use is : but not sure of the correct units to use.

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