Light of 546 nm (5.46 x 10 -7 m) wavelength from a mercury lamp passes through a

Question:

Light of 546 nm (5.46 x 10^-7 m) wavelength from a mercury lamp passes through a diffraction grating with a spacing between adjacent slits of 0.005 mm (5 x 10^-6 m). A screen is located a distance of 2.5 m from the grating.
a. How far from the center of the screen will the first order bright fringe lie?
b. How far from the center of the screen will the second order bright fringe lie?