Published 2001
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Earlier Fresnel Lenses

  • 1. Tokyo University of Agriculture and Technology
  • 2. Natural Sciences Sector, UNESCO, Paris Cedex 15, France

Description

Refraction occurs when a ray passes through surfaces separating materials with different indices of refraction. The contour of these surfaces define the focusing properties of the optical element. The bulk of material between the refracting surfaces has little effect on the optics of the lens.
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