A student has two diffraction gratings, a measuring tape, a monochromatic light source of unknown wavelength, and a clamp a known distance L from the white wall to be used as a screen. One diffraction grating has a known distance d1 between slits; the other has the unknown distance we will call d2. To find the distance d2, the student must take which data?
1.measure the distance from the central maximum to the first order maximum while the first diffraction grating is in the clamp
2.measure the distance from the central maximum to the first order maximum while the second diffraction grating is in the clamp
3.both of these choices
4.None of these choices—there are too many unknowns to find the distance in question.
3
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