Enter the light perpendicular to the hypotenuse of the Prism above or below the center of the hypotenuse. The light will reflect off the two non-hypotenuse sides and reflect back out in the opposite direction, 180 de Save grees.
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A one diopter prism will deviate a ray of light 1cm at a distance of one meter.
A right angled isosceles ie. a 45 - 90 - 45 degree prism is called a totally reflecting prism.
Cut the prism by a plane that is angled so that three of the prism's vertices are on one side of the plane and three on the other. The resulting cross-section will be a hexagon.
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It splits white light up into the colors of the visible spectrum, but if the colors go through another prism, they turn into white light again.