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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 942-943 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Any lens with spherical surfaces may be used as a double focus lens, by making use of the second focus formed by light reflected internally at the lens surfaces. The focal power of a weak bispherical spectacle trial case lens is about seven times as great as the marked power for this doubly ...
    Type of Medium: Electronic Resource
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