Wave Optics32324.40With 2 000 lines per centimeter, the grating spacing is 461cm5.0010cm5.0010m2000d−−==×=×sindmThen, from θλ=, the location of the first order for the red light is ()( )9116164010msin7.355.0010m−−×=×sinmd°24.41The grating spacing is 261 cm10m3.63610m2 7502 750−−=×d. From sin=, or ( )1sinmd−=, the angular positions of the red and violet edges of the second-order spectrum are found to be ( )9r62 70010m2sinsin22.653.63610mredd−−×=×°and ( )9v62 40010m2sinsin12.713.63610mvioletd−−××=°Note from the sketch at the right that rrtanyL=and vtanv=, so the width of the spectrum on
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