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A blucher (/ ˈ b l uː tʃ ər / or / ˈ b l uː k ər /, German pronunciation:, Blücher) is a style of shoe with open lacing, its vamp made of a single piece of leather ("one cut"), with shoelace eyelets tabs sewn on top. [1] The blucher is similar to a derby since both feature open lacing, in contrast to the Oxford shoe, which uses closed ...
If when the quantity of light i polarized in the plane a 1 proceeds from 1 in the direction of the given ray, that part k thereof of light polarized in a 2 arrives at 2, then, conversely, if the quantity of light i polarized in a 2 proceeds from 2, the same quantity of light k polarized in a 1 [Kirchhoff's published text here corrected by ...
Oxford shoes are also known for their variation or style. The Cap-Toe Oxford is the most well-known, although 'Whole Cut', 'Plain Toe', and a variation of 'Brogue' Oxfords are commonly referred to styles. [5] Shoes with closed lacing (Oxfords/Balmorals) are considered more formal than those with open lacing (Bluchers/Derbys). [6]
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 ...
In American English the derby shoe may be referred to as a 'blucher', although technically the blucher is a different design of shoe where only eyelet tabs (not larger quarters) are sewn onto a single-piece vamp. In modern colloquial English the derby shoe may be referred to as 'bucks' when the upper is made of buckskin. [3] "
Reflection of light is either specular (mirror-like) or diffuse (retaining the energy, but losing the image) depending on the nature of the interface.In specular reflection the phase of the reflected waves depends on the choice of the origin of coordinates, but the relative phase between s and p (TE and TM) polarizations is fixed by the properties of the media and of the interface between them.
Fermat's principle is most familiar, however, in the case of visible light: it is the link between geometrical optics, which describes certain optical phenomena in terms of rays, and the wave theory of light, which explains the same phenomena on the hypothesis that light consists of waves.
Light spectrum, from Theory of Colours – Goethe observed that colour arises at the edges, and the spectrum occurs where these coloured edges overlap.. Theory of Colours (German: Zur Farbenlehre) is a book by Johann Wolfgang von Goethe about the poet's views on the nature of colours and how they are perceived by humans.