A diffraction grating with line spacing $d$ is illuminated by monochromatic light of frequency $f$. The speed of light is $c$. Which expression may be used to find the greatest order of intensity maximum formed by the grating?
- A$n = \dfrac{d}{cf}$
- B$n = \dfrac{df}{c}$
- C$n = \dfrac{dc}{f}$
- D$n = \dfrac{c}{df}$