White light strikes a diffraction grating (730 l i n e s / m m ) at normal incid

Question

White light strikes a diffraction grating (730lines/mm ) at normal incidence. Part A What is the longest wavelength that forms a second-order maximum? ? =   nm   SubmitMy AnswersGive Up White light strikes a diffraction grating (730lines/mm ) at normal incidence. White light strikes a diffraction grating (730lines/mm ) at normal incidence. White light strikes a diffraction grating (730lines/mm ) at normal incidence. White light strikes a diffraction grating (730lines/mm ) at normal incidence. Part A What is the longest wavelength that forms a second-order maximum? ? =   nm   SubmitMy AnswersGive Up Part A What is the longest wavelength that forms a second-order maximum? ? =   nm   SubmitMy AnswersGive Up Part A What is the longest wavelength that forms a second-order maximum? ? =   nm   SubmitMy AnswersGive Up Part A What is the longest wavelength that forms a second-order maximum? ? =   nm   SubmitMy AnswersGive Up Part A What is the longest wavelength that forms a second-order maximum? ? =   nm   SubmitMy AnswersGive Up Part A What is the longest wavelength that forms a second-order maximum? ? =   nm   SubmitMy AnswersGive Up ? =   nm   ? =   nm   SubmitMy AnswersGive Up White light strikes a diffraction grating (730lines/mm ) at normal incidence. Part A What is the longest wavelength that forms a second-order maximum? ? =   nm   SubmitMy AnswersGive Up

Explanation / Answer

apply d sin theta = mL

here theta = 90

d = 1/730 = 1.37 um,

so wavelength L = 1.37 um * sin 90/2

L = 685 nm

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