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 19.1 are likely candidates: silica glass, Pyrex glass, corundum, spinel, polystyrene, and polytetrafluoroethylene? Justify your selection(s).
Table 19.1 Refractive Indices for Some Transparent Materials
Material | Average Index of Refraction |
Ceramics | |
Silica glass | 1.458 |
Borosilicate (Pyrex) glass | 1.47 |
Soda–lime glass | 1.51 |
Quartz (SiO2) | 1.55 |
Dense optical flint glass | 1.65 |
Spinel (MgAl2O4) | 1.72 |
Periclase (MgO) | 1.74 |
Corundum (Al2O3) | 1.76 |
Polymers | |
Polytetrafluoroethylene | 1.35 |
Poly(methyl methacrylate) | 1.49 |
Polypropylene | 1.49 |
Polyethylene | 1.51 |
Polystyrene | 1.60 |
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