Prism Diopter (PD)


Prism Diopter (PD) : A unit used in optics to measure the deflection of light by a prism. One prism diopter represents a deflection of 1 centimeter measured at a distance of 1 meter from the prism. Mathematically, the deflection in prism diopters is equal to 100 times the tangent of the angle through which the path of the light is bent in passing through the prism
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