For a wavelength of 420 nm, a diff raction grating
Chapter , Problem 45(choose chapter or problem)
For a wavelength of 420 nm, a diff raction grating produces a bright fringe at an angle of 268. For an unknown wavelength, the same grating produces a bright fringe at an angle of 418. In both cases the bright fringes are of the same order m. What is the unknown wavelength?
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