Question

6. [15 ptsJTwo glass plates are 15.0 cm long. At one end they are in contact, at the other end they are separated by 0.03 mm. Assume normal incidence with a monochromatic light (wavelength in air is 50nm) a) Is the fringe at the line of contact bright or dark? Explain your answer. What is the spacing of the bright b) If the glass plates have n 1.6 and space between plates contains water (n 1.33). Is the fringe at the line c) If the top plate has n-1.4 and the bottom plate has n- 1.6. the wedge is filled with grease with n-1.5. Is interference fringes? of contact bright or dark? What is the spacing of the bright interference fringes? the fringe at the line of contact bright or dark? What is the spacing of the bright interference fringes now? Glass

Answer 1

2 x 003 CA e Com tact