Monochromatic Light from a He-Ne Laser $\lambda$ = 6328 Nm)is Incident on a Diffraction Grating Containing 5 000

Multiple Choice

Monochromatic light from a He-Ne laser ( $\lambda$ = 632.8 nm) is incident on a diffraction grating containing 5 000 lines/cm.Determine the angle of the first-order maximum.

A) 18.4 $\degree$
B) 39.2 $\degree$
C) 14.6 $\degree$
D) 27.7 $\degree$
E) 13.9 $\degree$