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K is dependent on gas composition, temperature, and the wavelength of the light passing through the medium. In gases K is typically between 0:1 10 3 and 1:5 10 3 (kg/m3) 1. K is therefore much smaller than 1, so the refractive index varies only in the third or fourth decimal place.
In this laboratory, we will use a Michelson interferometer to (a) measure the wavelength of light from a Ne-He laser, (b) measure the index of refraction of air, and (c) study the interference of linearly polarized light beams. 1.1 How the Interferometer Works.
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Since our model for light satisfies the wave equation we have the following relationships: c = fλ, n =c/v = fλo/ (fλ) = λo / λ (19.1) where λ is the wavelength in medium, n is the index of refraction of the medium, f is the frequency of the light wave, and λ 0 is its wavelength in a vacuum.
The values are listed for a particular wavelength of light, because they vary slightly with wavelength. (This can have important effects, such as colors produced by a prism.) Note that for gases, \(n\) is close to 1.0.
13 Μαρ 2024 · Interferometers generally are used to measure very small displacements by using the wave property of light (or other radiation e.g. low energy neutrons). They measure changes of the interference pattern when waves with different phases overlap.
the maxima and minima can be used to determine the wavelength of the light. Conversely, if the wavelength of the light is known, the spacing of the slits could be determined from the interference patterns.
