The Distance Between the Ruled Lines on a Grating Is

question 110

Multiple Choice

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

• A)590 nm
• B)570 nm
• C)550 nm
• D)530 nm
• E)610 nm

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