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  2. Principles of Optics - Wikipedia

    en.wikipedia.org/wiki/Principles_of_Optics

    The fifth edition was reprinted in 1975 and 1977. [10] Between 1983 and 1993, the sixth edition of the book was reprinted seven times. [3] Some of these reprints, including those in the years 1983 and 1986, included corrections. [10] Cambridge University Press produced a reprint of the 6th Edition in 1997.

  3. James while John had had had had had had had had had had had ...

    en.wikipedia.org/wiki/James_while_John_had_had...

    The sentence can be given as a grammatical puzzle [7] [8] [9] or an item on a test, [1] [2] for which one must find the proper punctuation to give it meaning. Hans Reichenbach used a similar sentence ("John where Jack had...") in his 1947 book Elements of Symbolic Logic as an exercise for the reader, to illustrate the different levels of language, namely object language and metalanguage.

  4. List of light sources - Wikipedia

    en.wikipedia.org/wiki/List_of_light_sources

    This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...

  5. Opticks - Wikipedia

    en.wikipedia.org/wiki/Opticks

    Book III to the 1730 edition of Opticks containing queries 1 to 4. Newton originally considered to write four books, but he dropped the last book on action at a distance. [7] Instead he concluded Opticks a set of unanswered questions and positive assertions referred as queries in Book III. The first set of queries were brief, but the later ones ...

  6. The Armour of Light - Wikipedia

    en.wikipedia.org/wiki/The_Armour_of_Light

    The Armour of Light is a historical fiction novel by Welsh author Ken Follett. [ 1 ] [ 2 ] It is the fifth book in the Kingsbridge Series , and is the sequel to A Column of Fire . The Armour of Light takes place in the years 1792–1824 in Kingsbridge, the same fictional English town in The Pillars of the Earth .

  7. Light verb - Wikipedia

    en.wikipedia.org/wiki/Light_verb

    The light verbs are underlined, and the words in bold together constitute the light verb constructions. Each of these constructions is the (primary part of the) main predicate of the sentence. Note that the determiner a is usually NOT part of the light verb construction. We know that it is not part of the light verb construction because it is ...

  8. Fifth force - Wikipedia

    en.wikipedia.org/wiki/Fifth_force

    In physics, a fifth force refers to a hypothetical fundamental interaction (also known as fundamental force) beyond the four known interactions in nature: gravitational, electromagnetic, strong nuclear, and weak nuclear forces. Some speculative theories have proposed a fifth force to explain various anomalous observations that do not fit ...

  9. Sky brightness - Wikipedia

    en.wikipedia.org/wiki/Sky_brightness

    Light pollution is an ever-increasing source of sky brightness in urbanized areas. In densely populated areas that do not have stringent light pollution control, the entire night sky is regularly 5 to 50 times brighter than it would be if all lights were switched off, and very often the influence of light pollution is far greater than natural ...