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2. Sellmeier equation - Wikipedia

   en.wikipedia.org/wiki/Sellmeier_equation

   For common optical glasses, the refractive index calculated with the three-term Sellmeier equation deviates from the actual refractive index by less than 5×10 −6 over the wavelengths' range [5] of 365 nm to 2.3 μm, which is of the order of the homogeneity of a glass sample. [6]

3. Fresnel equations - Wikipedia

   en.wikipedia.org/wiki/Fresnel_equations

   In the above formula for r s, if we put = ⁡ / ⁡ (Snell's law) and multiply the numerator and denominator by ⁠ 1 / n 1 ⁠ sin θ t, we obtain [10] [11] = ⁡ ⁡ (+).

4. Scherrer equation - Wikipedia

   en.wikipedia.org/wiki/Scherrer_Equation

   The Scherrer equation, in X-ray diffraction and crystallography, is a formula that relates the size of sub-micrometre crystallites in a solid to the broadening of a peak in a diffraction pattern. It is often referred to, incorrectly, as a formula for particle size measurement or analysis. It is named after Paul Scherrer.

5. Redken - Wikipedia

   en.wikipedia.org/wiki/Redken

   The company was founded in 1960 by Jheri Redding and Paula Kent, thus the name, "Red-ken."Redken pioneered the "Scientific Approach to Beauty," and revolutionized the professional salon business by introducing the concept of protein reconditioning and developing new protein based products, which they patented.

6. Equivalent concentration - Wikipedia

   en.wikipedia.org/wiki/Equivalent_concentration

   Here, ⁠ 1 / f eq ⁠ can have a fractional (non-integer) value. In precipitation reactions, the equivalence factor measures the number of ions which will precipitate in a given reaction. Here, ⁠ 1 / f eq ⁠ is an integer value. Normal concentration of an ionic solution is also related to conductivity (electrolytic) through the use of ...

7. Woodbury matrix identity - Wikipedia

   en.wikipedia.org/wiki/Woodbury_matrix_identity

   Alternative names for this formula are the matrix inversion lemma, Sherman–Morrison–Woodbury formula or just Woodbury formula. However, the identity appeared in several papers before the Woodbury report.