A thin layer of SiO, having an index of refraction 1.5, is used as coating on certain solar cells. The refraction index of the solar cell is 3.5. The thickness of the SiO layer is D = 200 nm. If a visible beam with wavelength 2 (in air) has constructive interference when reflected from the top of the SiO layer, which of the following value can be the wavelength 1? Visible light spectrum is from 380 to 730 nm. 1 nm =1x10 9 m. air D Sio solar cell 500 nm 400 nm 460 nm 600 nm 540 nm 300You pass 633-nm laser beam through a narrow slit and observe the diffraction pattern on a screen 6 m away. If the slit width is 3x104 m, what is the distance between the first-order and the fifth-order dark fringe on the screen? Only consider dark fringes on one side of the central bright fringe. 1 cm = 1x102 m. O 2 cm 16 cm 5 cm 9 cm O 7 cm 22 cm