Monochromatic Light of Wavelength 500 Nm Is Incident Normally on a Diffraction

Multiple Choice

Monochromatic light of wavelength 500 nm is incident normally on a diffraction grating.If the third-order maximum of the diffraction pattern is observed at 32° from the centerline,what is the distance between the slits of the grating?

A) 0.93 μm
B) 1.4 μm
C) 2.8 μm
D) 8.5 μm