Refractive indices wavelength dependence

When light penetrates a smoke filled or partially filled space, its intensity is reduced because of absorption and scattering by smoke particles. The level of attenuation depends on particle size and shape, refractive index, wavelength and angle of incidence of the hght. 

Here c is the concentration of polymer, X = Xlfi ) is the wavelength of light in the medium (of refractive index no), and K is an optical constant depending on refractive index, wavelength and polarization of the beam. A double extrapolation oiKc/Rg versus sin 0 + kc where k is an arbitrary constant, for a series of concentrations and angles is called a Zimm plot. In the limit 0 —> 0,... 

The index of refraction (n, the nominal value). Since the index of refraction is wavelength dependent, refer to more detailed sources for the index at your wavelengths. 

Here, the wavelength of the laser light is A, and is a correction term due to the wavelength dependence of the refractive index of the etalon material ( = 0.034 at 514.5 nm when fused silica etalons are used to achieve the necessary delay, or = 0 when a lens combination is used). The optical correction term Av/v results from the change in refractive index of the window material with shock stress (Barker and Hollenbach, 1970). If the measure-... 

The refractive index of the sample can be written as a complex number 2 = n2 — ik2. At wavelengths where the sample is not absorbing, 2, the absorption constant, equals zero. However, kj is non-zero at wavelengths where the sample is absorbing. In transmission spectroscopy, the intensity of an absorption band depends almost entirely on k2 while in ATR the intensity of the same band is a complex function of 2 and 2- Nevertheless, the statement made previously still holds. There will be absorption bands in ATR at wavelengths where 2 0. Thus, bands are expected at the same wavelengths in transmission and in ATR but their intensities may be dissimilar. 

The effects of temperature on the color development of the porous film in chlorobenzene were shown in Table 6 [23]. The coloration was reversible thermochromism. The refractive index of the materials generally decreases as the temperature increases, and the temperature dependence of the liquid is greater than that of the solid. For example, the temperature dependence (A/id/°C) of PVA and chlorobenzene was found to be 3.0 x 10 and 4.5 x 10" at 589.3 nm. Consequently, it is interpreted that the wavelength of the crosspoint between the dispersion curves of PVA and chlorobenzene shifts from the long side to the short side with increasing tem-... 

Figure 6. Chromatism is due to the wavelength dependence of the index of refraction and produces coloured, diffuse and/or elongated images. For simplicity reasons, the off-axis image in the figure above is shown with pure lateral chromatism in reality both axial and lateral chromatisms would combine.

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