The Distance Between the Ruled Lines on a Diffraction Grating $1770 \mathrm {~nm}$

question 102

Multiple Choice

The distance between the ruled lines on a diffraction grating is $1770 \mathrm {~nm}$ . The grating is illuminated at normal incidence with a parallel beam of white light in the $400 \mathrm {~nm}$ to $700 \mathrm {~nm}$ wavelength band. What is the longest wavelength that appears in the third order spectrum?

• A) \(590 \mathrm {~nm}\)
• B) \(570 \mathrm {~nm}\)
• C) \(530 \mathrm {~nm}\)
• D) \(610 \mathrm {~nm}\)
• E) \(550 \mathrm {~nm}\)

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