Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 327
320 Flano Concave Lens,r /=- m—1 The optical centre is in the concavesurface. … 321 Concavo-convex Lens, /=- (m-l)(jK-r) Draw B and r parallel to one another.Draw n o} then o is the optical centre. Optic?. 297
Mechanical engineering · Engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
