A Diffraction Grating Has Rulings of 890 Lines/mm

question 18

Multiple Choice

A diffraction grating has rulings of 890 lines/mm.When white light is incident normally on the grating,what is the longest wavelength that forms an intensity maximum in the fifth order?

• A) 225 nm
• B) 200 nm
• C) 250 nm
• D) 275 nm
• E) 300 nm

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