a. Describe the dispersion in the red wavelength region around 650 nm (both in °/nm and in...

a. Describe the dispersion in the red wavelength region around 650 nm (both in °/nm and in nm/mm) for a transmission grating 6 cm wide, containing 3500 grooves/cm, when it is focused in the third-order spectrum on a screen by a lens of focal length 150 cm.

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b. Find the resolving power of the grating under these conditions.

Figure 1.