Light of wavelength 690 nm passes through two narrow
Chapter 34, Problem 34.49(choose chapter or problem)
Light of wavelength 690 nm passes through two narrow slits0.66 mm apart. The screen is 1.60 m away. A second sourceof unknown wavelength produces its second-order fringe1.23 mm closer to the central maximum than the 690-nmlight. What is the wavelength of the unknown light?
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