3. {2G points} Coherent1 monochromatic light of unknown wavelength enters a double slit apparatus with unknown slit spacing. (You can assume That The slit width is veryr small, so That you can neglect diffraction effects.) Dn a distant, innitel}r large screen, we observe That The 5th order maximum [not counting the central maximum} occurs at an angle of 49" above The optic axis. a.) I: ll] points] What is the total number of bright Iringes on the screen? b.) {I'D points] What is the angular spread of The 5Th order bright fringe"?I {In other words, what is The angle dillerence l'l between lhe neighboring dark fringes above and below The 5th order maximum?)