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 651
dat the principal focus of a lens L, so that the rays emerge from Lin the form of a parallel beam. A and L are fixed in a tube, the wholebeing called the collimator. The parallel beam falls on the prism,is deviated, and then reaches the objective M of the telescope, beingbrought to a focus at the… … Fio. 580.—Plan of the spectrometer. so that it can be rotated about the axis O of the spectrometer. Its position with respect to the scale S can be observed by means ofthe vernier V. Expt. 142.—Determination of the angle of a prism by means of thespectrometer. Focus the cross-wires by drawing the…
Physics
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