Light from a Laser Strikes a Diffraction Grating That Has

Light from a laser strikes a diffraction grating that has 6500 grooves per centimeter.The central and first order principal maxima are separated by 0.325 m on a wall 1.00 m from the grating.Determine the wavelength of the laser light.

A) 449 nm
B) 476 nm
C) 454 nm
D) 465 nm
E) 488 nm