Part A Light from a sodium lamp () = 589 nm) illuminates two narrow slits. The fringe spacing on a screen 180 cm behind the slits is 4.8 mm . What is the spacing (in mm) between the two slits? Express your answer using two significant figures. ? d = mm Submit Previous Answers Request AnswerPart A A 4.8-cm-wide diffraction grating has 2500 slits. It is illuminated by light of wavelength 520 nm . What is the angle (in degrees) of the first diffraction order? Express your answer using three significant figures. IVO ? 61 = Submit Request Answer Part B What is the angle (in degrees) of the second diffraction order? Express your answer using three significant figures. AEp ? 02 = Submit Request