What Must Be the Resolving Power of a Grating Allowing

Multiple Choice

What must be the resolving power of a grating allowing a spectral line at 683.80 nm to be distinguished from another line differing by 0.33 nm? (1 nm = 10−⁹ m)

A) 2,100
B) 46
C) 4,300,000
D) 230
E) ​684