Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 117
FOCAL LENGTHS OF LENSES. Ill III. Rays diverging from the principal focus of a convex lensare refracted parallel. .IV. Diverging rays, emanating from a point in the axis moredistant than the principal focus, converge after refraction,and the point of convergence approaches the principal con-jugate…
Physics
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