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How do I calculate my working distance after my image is reflected from a right angle prism?

The distance through glass, such as that used to manufacture our Right Angle Prisms, relate to an equivalent distance through air via a simple equation. Take the distance traveled through glass (d) and multiple it be the refractive index of the glass (nd) to get the equivalent distance through air, or Optical Path Length (OPL):

d x nd = OPL

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