Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 327
/- + ■ Convex-concave Lens (Meniscus.)Br(m—l)(R—r) Draw the radii R and r parallel toone another.—Draw n o, then o is theoptical centre. … 319 Double Concave Lens.Br f=- (m—l)(R+r)
Mechanical engineering · Engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
