pair of eyeglasses has an antireective coating applied to the lenses. The lenses themselves are made of glass with index of refraction 1.6. The coating has an index of refraction that is smaller than the glass. The coating is 80mm thick and allows complete destructive interference of blue light of wavelength 450nm that shines directly perpen dicular to the lens. What is the index of refraction of the coating material? A. 1.4 B. 0.8 C. 1.3 D. 1.1 E. 1.5 6. In the figure below, the light-colored medium is air (index of refraction 1) and the dark- color medium is zinc-oxide (index of refraction 1.7). Which of the options shown are a reasonably accurate portrayal of a light beam hitting the boundary and undergoing reflection and transmission? (i) (ii) (iii) (iv) (v) A. (ii) and (iv) only B. (i) and (v) only C. (ii) and (v) only D. (iii) and (iv) only E. (i) and (iv) only