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 647
A long-sighted person whose nearest distance of distinct vision is 50 cm.finds that this distance is reduced to 20 cm. by using spectacles. Findthe nature and focal length of the lenses used. L.U. CHAPTER XLVIII PRISMS AND DISPERSION Refraction by prism.—In the case of a piece of plate-glass… … Fig. 576.— Deviation produced by a prism. purposes, called a prism, must be found from a knowledge of therefractive index of the material. Thus for a ray PQRS (Fig. 576)sin //sin r=fi and sin t/sin r =/x. The emergent ray RS is not parallelto the incident ray PQ, since at each surface there has…
Physics
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