Problem-1) (15pts) A diffraction grating with 400 lines/mm is illuminated with light of wavelength 343 nm. What is the angular separation between the two second-order bright fringes?Problem3) (15pts) Treat the pupil of your eye as a circular aperture of diameter 3.5 mm. Light of wavelength 500 nm is used to view two point sources that are I = 300m away from you. How far apart must these two point sources be if they are to be just barely resolved by your eye, assuming that the resolution is limited by diffraction? (Hint s = 10 )