General Relativity and Gravitation

, Volume 13, Issue 12, pp 1157–1160 | Cite as

On the transition from Weyl to Ricci focusing

  • C. C. Dyer
  • R. C. Roeder
Research Articles


Using the weak-field approximation, we show that the Weyl focusing of rays in a beam of light which passes around a number of spherical deflectors may be approximated by the Ricci focusing of the beam due to the enclosed mass.


Differential Geometry Spherical Deflector Enclose Mass 
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Copyright information

© Plenum Publishing Corporation 1981

Authors and Affiliations

  • C. C. Dyer
    • 1
  • R. C. Roeder
    • 1
  1. 1.Scarborough College and David Dunlap ObservatoryUniversity of TorontoTorontoCanada

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