LASER diffraction - angle?

Question

3. You have a laser with wavelength = 635.3[nm]. The grating has a slit spacing of 1.633E-03[mm]. What is the angle measured for n=1?
angle = ___________[radian]
Use three sig. figs.; or use N/A, if not enough information is given.

Answer 1

d x sin(angle) = n x wavelength = (in this question) wavelength. Now you do it. Set your calculator to radians for the answer in radians.

(Note to others: let him/her do the tedious bit!)