A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 618
Fig. 543.—Measurement of focal length of a converging lens. in position. Measure AL and BL, and calling them u and v, calculate /.Repeat for a number of distances, and tabulate the results as describedon p. 570. Optical centre of a lens.—For every lens there is some point forwhich the rays passing… … Fig. 544.—Optical centre of a lens. . being the normals to the surfaces, the surfaces are parallel to eachother at C and D. The ray which passes along the path COD in thelens has thus the same direction before entering as it has afteremerging (p. 576), and is therefore undeviated. It is…
Physics
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