(Solved): A double-slit system is used to measure the wavelength of light. The system has slit spacing d=15 ...

A double-slit system is used to measure the wavelength of light. The system has slit spacing $$d=15?\mathrm{m}$$ and slit-to-screen distance $$L=2.8\mathrm{m}$$. If the $$m=1$$ maximum in the interference pattern occurs $$7.5\mathrm{cm}$$ from screen center, what is the wavelength? Express your answer in nanometers.