3. You have a laser with wavelength = 634.9[nm]. The grating has a slit spacing
ID: 1290913 • Letter: 3
Question
3. You have a laser with wavelength = 634.9[nm]. The grating has a slit spacing of 1.664E-03[mm]. What is the angle measured for n=1?
angle = [radian]
Use three sig. figs.; or use N/A, if not enough information is given.
4. You measure a distance from diffraction to screen to be 280[mm]. What should be the angle to the first spot measured off axis, if the distance from the center spot is 1.156E+02[mm]?
angle = [degree]
Use three significant figures or N/A, if not enough information is given.
5. What is the previous answer in radian?
angle = [radian]
Use three significant figures or N/A, if not enough information is given.
Explanation / Answer
3. apply d sin theta = mL
sin theta = 1 * 634.9 e-9 /(1.664 e-6)
sin theta = 0.381
theta =0.3908 rad
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4. again tan theta = Y/x = 115 mm/280 mm = 0.4107
theta = 22.32 deg
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5. in terms of radians it is = 0.389 radians
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