You measure a distance from diffraction to screen to be 350m

You measure a distance from diffraction to screen to be 350[mm]. What should be the angle to the first spot measured off axis, if the distance from the center spot is 1.486E+02[mm]?
angle = [degree]
Use three significant figures or N/A, if not enough information is given.

Solution

According to the given problem,

n=d*sin. where tan = sin =x/L

All measurements are in meters.

distance from diffraction to screen: 0.35m

sin = 0.1486 / 0.35

= 25.1°