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Reference.org
Wedge prism
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<p>The wedge prism is a <a href="/facts/Prism_(optics)/eodBFF70">prism</a> with a shallow <a href="/facts/Angle/gFUTEQYq">angle</a> between its input and output surfaces. This angle is usually 3 <a href="/facts/Degree_(angle)/f48Ns8SX">degrees</a> or less. <a href="/facts/Refraction/S8kvSKzM">Refraction</a> at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism. </p>