Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 447
ying power of this instrument i equals approximatelythe focal length of the object-glass divided by the focal length of theeye-piece. 388. The Netvtonian reflecting telescope. For an instrument of moderate cost, specially adapted to schooland college use owing to the ease of manipulation and the… … Fig. 327. which cannot be obtained in a refractor.^ Fig. 327 represents ahorizontal sectional view of this instrument. Incident rays arereflected from the parabolic mirror, M; striking the rectangularprism, m n, they undergo total reflection, and form at a 6 a smallimage of the heavenly body. The…
Physics
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