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Your friend has been given a laser for her birthday. Unfortunately, she did not receive a...

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 5.3 mm apart on a screen 1.4 m from the slits.

What is the wavelength the laser emits?

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