๐๐จ๐๐๐ฒ'๐ฌ ๐๐๐๐๐๐๐๐๐ ๐๐ก๐๐ซ๐ : ๐๐ง๐๐๐ซ๐ฌ๐ญ๐๐ง๐๐ข๐ง๐ ๐๐๐๐ซ๐๐๐ญ๐ข๐ฏ๐ ๐๐ง๐๐๐ฑ
๐๐จ๐๐๐ฒ'๐ฌ ๐๐๐๐๐๐๐๐๐ ๐๐ก๐๐ซ๐ ๐๐ง๐๐๐ซ๐ฌ๐ญ๐๐ง๐๐ข๐ง๐ ๐๐๐๐ซ๐๐๐ญ๐ข๐ฏ๐ ๐๐ง๐๐๐ฑ The refractive index (RI) of a polymer is the ratio of the speed of light in a vacuum to the speed of light through the polymer. It varies with frequency (and thus wavelength) of light. Typically, it is measured at well-defined spectral wavelengths; for example, the yellow sodium double emission at 589nm wavelength. As other properties, refraction indices are temperature dependent. RI of air and water are 1.0 and 1.31 respectively. ๐๐ก๐ซ๐๐ ๐ฉ๐ซ๐จ๐ฉ๐๐ซ๐ญ๐ข๐๐ฌ ๐จ๐ ๐ฉ๐จ๐ฅ๐ฒ๐ฆ๐๐ซ๐ฌ ๐๐ซ๐ ๐ซ๐๐ฅ๐๐ญ๐๐ ๐ญ๐จ ๐ญ๐ก๐๐ข๐ซ ๐ซ๐๐๐ซ๐๐๐ญ๐ข๐ฏ๐ ๐ข๐ง๐๐๐ฑ: Light rays change direction when they cross the interface from air to the polymer. Light reflects partially from surfaces that have a refractive index different from that of their surroundings. The dispersive effect due to the diversity of the wavelengths of the light, the bending effect being frequency dependent. The lower the ...