Application of properties of the light

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To determine which diffraction grating has 10,000 lines/cm, use a red laser to illuminate both gratings separately and project the resulting diffraction patterns onto a detection screen. Measure the angle of the first-order diffraction maximum for each grating. The grating with more lines will produce a narrower angle for the same wavelength due to its higher line density. By comparing the angles, the grating that results in a smaller angle corresponds to the 10,000 lines/cm grating. This method effectively identifies the gratings based on their diffraction properties.
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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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