A Diffraction Grating Has 450 Lines Per Mm

question 49

Multiple Choice

A diffraction grating has 450 lines per mm.What is the highest order m that contains the entire visible spectrum from 400 nm to 700 nm?

• A) m = 2
• B) m = 3
• C) m = 4
• D) m = 5
• E) m = 6