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Please answer this . Thank you A diffraction grating with 300 lines/mm is used with a laser to obtain 7 dots on a particular screen

Please answer this . Thank you

A diffraction grating with 300 lines/mm is used with a laser to obtain 7 dots on a particular screen as shown in the figure below. Find the wavelength of the laser (in nm) if x = 1.37 m. X 190 cm 20 cm

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