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optical centre |
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centre, optical That point (real or virtual) on the optical axis of a lens which is, or appears to be, traversed by rays emerging parallel to their original direction. Applied to an ophthalmic lens, it is commonly regarded as coinciding with the vertex of either surface (British Standard). See nodal points; vertex. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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