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    Help please..Name:  20151112_184202[1].jpg
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    A parallel beams of light of wavelenght 589nm was directed normally onto a plane.Diffraction grating measurementshowed that the angle between the first order spectrum on either side of the normal was 32.4degrees.Calculate the number of lines per millimiter on grating
    the picture is where I got stuck
 
 
 
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Updated: November 12, 2015
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