2. In Figure 2, monochromatic light with a wavelength in air of λ= λ0 = 500 nm shines normally on a pair of identical glass microscopic slides (I= 10.0 cm in length) that form a very narrow wedge (with thickness h = 0.0200 mm). The top surface of the upper slide and the botton surface of the lower slide have special coatings on them so that they reflect no light. In the following, which position corresponds to a dark fringe? (A) x = 1.75 mm, (B) x = 1.00 mm, (C) x = 1.25 mm, (D) x = 2.20 mm, (E) x = 2.15 mm. A periodic transverse wave travels along an x-axis. Figure 3(a) gives the displacements of elements as a function of x at time t = 0. Figure 3(b) gives the displacements of elements at x = 0 as a function of time t.