Prentice position

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The Prentice position

The Prentice position is an orientation of a prism, used in optics and ophthalmology. In this position, the prism is oriented such that light enters it at an angle of 90° to the first surface, so that the beam does not refract at that surface. All the deviation caused by the prism takes place at the exit surface.

Plastic prisms and prism bars are calibrated according to the angle of minimum deviation, whereas glass prisms are calibrated according to Prentice's rule.[citation needed]

Classically, the Prentice position was used only for glass prisms.[1] With plastic prisms, the prism is held in the frontal position.

See also

References

  • Elkington, A.R.; Frank, H.J., Greaney, M.J., Clinical Optics Third Edition ISBN 0-632-04989-8
  1. ↑ Thompson, J.T.; Guyton, D.L. (Mar 1983). "Ophthalmic prisms. Measurement errors and how to minimize them". Ophthalmology 90 (3): 204–10. PMID 6866442. 
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