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2. List of Greek and Latin roots in English/V - Wikipedia

   en.wikipedia.org/.../V

   Root Meaning in English Origin language Etymology (root origin) English examples vac-empty: Latin: vacare: evacuate, vacancy, vacant, vacate, vacation, vacuous, vacuum vacc-

3. List of acronyms: V - Wikipedia

   en.wikipedia.org/wiki/List_of_acronyms:_V

   pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words). (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome (i) = initialism, e.g.: CD – (i) compact disc

4. Four-letter word - Wikipedia

   en.wikipedia.org/wiki/Four-letter_word

   The term four-letter word serves as a euphemism for words that are often considered profane or offensive.. The designation "four-letter" arises from the observation that many (though not all) popular or slang terms related to excretory functions, sexual activity, genitalia, blasphemies, and terms linked to Hell or damnation are incidentally four-character monosyllables.

5. Refractive index - Wikipedia

   en.wikipedia.org/wiki/Refractive_index

   A ray of light being refracted through a glass slab Refraction of a light ray. In optics, the refractive index (or refraction index) of an optical medium is the ratio of the apparent speed of light in the air or vacuum to the speed in the medium.

6. List of refractive indices - Wikipedia

   en.wikipedia.org/wiki/List_of_refractive_indices

   Refraction at interface. Many materials have a well-characterized refractive index, but these indices often depend strongly upon the frequency of light, causing optical dispersion. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength (λ) of 589 nanometers.

7. Snell's law - Wikipedia

   en.wikipedia.org/wiki/Snell's_law

   Snell's law (also known as the Snell–Descartes law, the ibn-Sahl law, [1] and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.

8. Specular reflection - Wikipedia

   en.wikipedia.org/wiki/Specular_reflection

   Specular reflection, or regular reflection, is the mirror-like reflection of waves, such as light, from a surface. [ 1 ] The law of reflection states that a reflected ray of light emerges from the reflecting surface at the same angle to the surface normal as the incident ray, but on the opposing side of the surface normal in the plane formed by ...

9. Atmospheric refraction - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_refraction

   Atmospheric refraction of the light from a star is zero in the zenith, less than 1′ (one arc-minute) at 45° apparent altitude, and still only 5.3′ at 10° altitude; it quickly increases as altitude decreases, reaching 9.9′ at 5° altitude, 18.4′ at 2° altitude, and 35.4′ at the horizon; [4] all values are for 10 °C and 1013.25 hPa ...