It is desired that the reflectivity of light at normal incidence to the surface of a transparent medium be less than 6.0%. Which of the following materials in Table 21.1 are likely candidates: silica glass, Pyrex glass, corundum, spinel, polystyrene, and polytetrafluoroethylene? Justify yourselection(s).

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Average Index of Refraction Material Сегanics 1.458 1.47 Silica glass Borosilicate (Pyrex) glass Soda-lime glass Quartz (SiO;) Dense optical flint glass Spinel (MgAl,O4) Periclase (MgO) Corundum (Al,O3) 1.51 1.55 1.65 1.72 1.74 1.76 Polymers Polytetrafluoroethylene Polymethyl methacrylate Polypropylene Polyethylene Polystyrene 1.35 1.49 1.49 1.51 1.60