The Resolving Power of a Diffraction Grating Is Defined by R

Multiple Choice

The resolving power of a diffraction grating is defined by R = $\lambda$ / $\Delta$$\lambda$ . Here $\lambda$ and $\lambda$ + $\Delta$$\lambda$ are:

A) any two wavelengths
B) any two wavelengths that are nearly the same
C) two wavelengths for which lines of the same order are separated by $\pi$ radians
D) two wavelengths for which lines of the same order are separated by 2 $\pi$ radians
E) two wavelengths for which lines of the same order are separated by half the width of a maximum