Two rectangular, optically flat glass plates (of index of refraction 1.46) are in con- tact along one end and are separated along the other end by a sheet of paper that is 58 μm thick. The top plate is illuminated by monochromatic light (of wavelength 583 nm). An interference pattern results from the re- flection of this light by the bottom surface of the top plate and the top surface of the bottom plate.What is the phase change as the light is reflected from the top surface of the bottom glass plate?1. ∆φ = 2 π2. none of these3. ∆φ = π 24. ∆φ = 0 5. ∆φ = π