What is the minimum number of slits required in a deffraction grating to just resolve light with wavelengths of 471.0 nm and 471.6 nm?
A) 99
B) 197
C) 393
D) 786
E) 1179

Question

Quizplus · Accepted Answer

The resolving power R of a diffraction grating is given by R = λ/Δλ = Nm, where N is the number of slits and m is the order of diffraction. For the first order (m=1), N = λ/Δλ = 471.0/0.6 ≈ 393.

What Is the Minimum Number of Slits Required in a Deffraction