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2. Cauchy's equation - Wikipedia

   en.wikipedia.org/wiki/Cauchy's_equation

   It deviates in the ultraviolet and infrared regions. In optics, Cauchy's transmission equation is an empirical relationship between the refractive index and wavelength of light for a particular transparent material. It is named for the mathematician Augustin-Louis Cauchy, who originally defined it in 1830 in his article "The refraction and ...

3. Pascal's law - Wikipedia

   en.wikipedia.org/wiki/Pascal's_law

   Continuum mechanics. Pascal's law (also Pascal's principle [1] [2] [3] or the principle of transmission of fluid-pressure) is a principle in fluid mechanics given by Blaise Pascal that states that a pressure change at any point in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere. [4 ...

4. Ray (optics) - Wikipedia

   en.wikipedia.org/wiki/Ray_(optics)

   Rays and wavefronts. In optics, a ray is an idealized geometrical model of light or other electromagnetic radiation, obtained by choosing a curve that is perpendicular to the wavefronts of the actual light, and that points in the direction of energy flow. [1] [2] Rays are used to model the propagation of light through an optical system, by ...

5. Fluid mechanics - Wikipedia

   en.wikipedia.org/wiki/Fluid_mechanics

   Fluid mechanics is the branch of physics concerned with the mechanics of fluids ( liquids, gases, and plasmas) and the forces on them. [1] : 3 It has applications in a wide range of disciplines, including mechanical, aerospace, civil, chemical, and biomedical engineering, as well as geophysics, oceanography, meteorology, astrophysics, and ...

6. Reflection coefficient - Wikipedia

   en.wikipedia.org/wiki/Reflection_coefficient

   In telecommunications and transmission line theory, the reflection coefficient is the ratio of the complex amplitude of the reflected wave to that of the incident wave. The voltage and current at any point along a transmission line can always be resolved into forward and reflected traveling waves given a specified reference impedance Z 0.

7. Absorption spectroscopy - Wikipedia

   en.wikipedia.org/wiki/Absorption_spectroscopy

   Absorption spectroscopy is spectroscopy that involves techniques that measure the absorption of electromagnetic radiation, as a function of frequency or wavelength, due to its interaction with a sample. The sample absorbs energy, i.e., photons, from the radiating field. The intensity of the absorption varies as a function of frequency, and this ...