What is a slanted triagular prism called?
406038
The oblique answer is correct. As for the slanted 3-D rectangle, I believe you are referring to a parallelepiped: http://mathworld.wolfram.com/Parallelepiped.html .
77085
Because it is refracting light that is coming from all around. When you see a rainbow produced by a prism it looks straight but if you were able to enlarge it enough it would be round.
481919
It is impossible to trisect an arbitrary angle using only compass and straightedge (but bisection is possible). No there is no mathematical technique (i.e a theoretical construction technique to do so, even if impractical). It cannot be done exactly. The best that can be done is approximation. One can imagine, I suppose, a radial arm (our radius rotating about a fixed  point) whose rotation speed was controlled very precisely by a computer and the speed could be extremely slow and a laser could be used with a super accurate quartz timer to 'print' a dot at fixed intervals thus dividing an arbitrary angle as desired. Certainly, technologically feasible, but I haven't heard anything about it, and it would be a technological technique, not a mathematical "breakthrough".
693823
The first person to look at a rainbow, since a rainbow is nothing more than a water vapor prism seen on a large scale. The first person credited with recognizing this, on the other hand is Ernst Abbe:\nAbbe prism\nFrom Wikipedia, the free encyclopedia\nJump to: navigation, search\nIn optics, an Abbe prism, named for its inventor, the German physicist Ernst Abbe, is a type of constant deviation dispersive prism similar to a Pellin-Broca prism.\n\nThe prism consist of a block of glass forming a right prism with 30°-60°-90° triangular faces. When in use, a beam of light enters face AB at point O, is refracted and undergoes total internal reflection from face BC, and is refracted again on exiting face AC. The prism is designed such that one particular wavelength of the light exits the prism at a deviation angle (relative to the light's original path) of exactly 60°. This is the minimum possible deviation of the prism, all other wavelengths being deviated by greater angles. By rotating the prism (in the plane of the diagram) around point O, the wavelength which is deviated by 60° can be selected.\n\nThe dispersive Abbe prism should not be confused with the non-dispersive Porro-Abbe or Abbe-Koenig prisms.
185133
Slant 6, 318, 360, 400, 440? Which one?
675011
The angle of incidence inside the prism is 25. (the ray passes straight into the prism as it is incident normally).\n \n\nmu = sin a/ sin g( g is the angle in glass and a is the angle in air)\nSin a = mu sin g \n\nsin a = 1.662 sin 25\n\nr = 45 \n for 1.698 , r =45.8 = 46.
691753
maybe a hexagonal prism http://en.wikipedia.org/wiki/Hexagonal_prism http://en.wikipedia.org/wiki/Prism_%28geometry%29
47572
Your eyedoctor is right. A prism is shaped like a triangle.On one end is the base and at the other end is a point. This is put in a optical lens to deviate the light.\n\nIn some hard contact lens a ballast can be put to keep it position. A ballast is like a prism but it is not used to deviate light like in a prescription lens.
902885
Trigonal planar.\n\n120 degrees.
926057
The above solution has to be repeated again on the inside of \nthe prism just before the light comes out the other side.\n\nThe light gets refracted twice, one on contact with the prism, and\nagain before exiting the prism.  So you have to calculate the\nangle of incidence on the inside of the prism given the apex\nangle of 46 and the refracted angle of 26.36. A geometry\nproblem. Then repeat above calculation.
954394
Newtonian reflectors are difficult to use for terrestrial observation because the image is inverted. Cassegrain-type reflectors (Schmidt-Cassegrain, Maksutov-Cassegrain, etc.) can be used with erecting prisms, or with a star diagonal if you're willing to put up with a mirror image view. The main problem with the Cassegranian reflectors is that their focal lengths are usually so long that you can't go lower than 40 or 50 power with them. Terrestrial spotting scopes are  most often used in the 20x to 40x range.
135770
trianglular pyramid has 8 edges and 5 verticles
671048
The correct spelling is anti-gogglin'.  "Anti" is the Greek prefix anti- 'against'.  "Goggle" is probably from the dialectal verb which means 'to squint, roll the eyes or the head' (from the 14th century).  This is the verb which gives us modern English "goggles".  The use of "anti-gogglin'" for 'slanted' probably comes from an extended meaning such as "you can tell it's crooked without squinting".
342120
equilangular in a trianle. if a triange is equilangular, it is equilateral, meaning all sides are the same length
269614
L=levorotary(left)\nD=dextrorotary(right)\nR=rectus(right)\nS=sinister(left)\n\nThe L and D refer to which way polarized light is rotated when passed through a solution, while R and S refer to absolute conformation at particular atoms.
166189
A Fresnel lens basically approximates the curvature of a spherical lens in small coaxial segments; the result being the same as if you cut a plano-convex or plano-concave lens into such segments and then cut off a hollow cylinder of material from each segment such that what remains is, roughly, the curved top, a newly-cut flat bottom, and one vertical side (i.e., a near-triangular cross section).  Obviously some material needs to be left to hold all these segments together, so there will be a small fourth side, i.e. a constant added thickness.  The 'curved' top may actually be flattened for easier manufacture.  Some old lighthouses use concentric circular 3-sided prisms, a real approximation.  I'd guess that segment size, valley and peak values depend on the material's mechanical properties more than optics.
792270
Hi I assume you mean an unsymmetrical item. I also assume you want a best fit. I have done similar things on a computer but not by hand. The computer finds three point most distant from the centroid and uses these points as pivots for three orthogonal planes. Not sure of the rest.