Application of properties of the light

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rojasharma
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you find two unlabelled diffraction gratings in your lab. from purchase records, you know that one grating has 500lines/cm, while the other has 10000lines/cm Given the following equipement, describe how you would determine which is the grating with 10 000lines/cm: red laser, detection screen, the two unknown dffraction gratings. no idea:(..need help
 
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Can anyone help me here pleaseeeeeeeeeeeeeeee..:(