A parallel beam of monochromatic light is incident normally on a plane transmission grating having 1250 lines/cm and a second order spectral line is observed at 30o . Calculate the wavelength of spectral line.

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A parallel beam of monochromatic light is incident normally on a plane transmission grating having 1250 lines/cm and a second order spectral line is observed at 30o . Calculate the wavelength of spectral line.

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