Question: You send light through a slit that is (150 mu mathrm{m}) wide. What is the wavelength of the light that you must use so that

You send light through a slit that is $150 \mu \mathrm{m}$ wide. What is the wavelength of the light that you must use so that the $n=1$ fringes are $1.8 \mathrm{~cm}$ apart on a screen $2.0 \mathrm{~m}$ from the slits?

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