00680cam a22002171a 4500 sg 19000079 DLC 20260227112738.0 740829s1918 enk 000 0 eng sg 19000079 (OCoLC)992893 DLC ONcM TxU DLC premarc QC383 .S5 Silberstein, Ludwik, 1872- Simplified method of tracing rays through any optical system of lenses, prisms, and mirrors / by Ludwik Silberstein. London ; New York : Longmans, Green and Co., 1918. ix, 37 p. : ill. ; 22 cm. Geometrical optics. Refraction. 90165 90165