 | Levi Washburn Leonard - 1830 - 350 pages
...focal distance, which is equal to half the diameter of the sphere. If another double convex lens FG be placed in the rays at the same distance from the focus, it will so refract the rays, that they shall go out of it parallel to one another. It is evident that all the rays except... | |
 | Sir Richard Phillips - 1832 - 286 pages
...white one, because it does not reflect so many rays. 235. If another double convex lens FG, fig. 41; be placed in the rays at the same distance from the focus that AB is, it will so refract the rays, that they shall go out of it parallel to one another. Illustration.... | |
 | Leonard Dunnell Gale - 1838 - 308 pages
...three seconds, and as much flint in thirty seconds. CCXIII. If another double-convex FG, fig. 122, be placed in the rays at the same distance from the focus, it will so refract the rays back again, that they will go out of it parallel to each other. Illustration. It is evident... | |
 | Leonard Dunnell Gale - 1838 - 280 pages
...three seconds, and as much flint in thirty seconds. CCXIII. If another double-convex FG, fig. 122, be i placed in the rays at the same distance from the focus, it ' will so refract the rays back again, that they will go out of it parallel to each other. Illustration. It is evident... | |
 | James Ferguson - 1839 - 554 pages
...sides, in the same manner FfG, as they converged in the space DfE in coming to it. If another glass FG, of the same convexity as DE, be placed in the rays at the same distance from the focus, it will retract them so, as that after going out of it, they will be all parallel, as a be, and go on in the... | |
 | Jeremiah Joyce - 1852 - 400 pages
...diverge ? T. Certainly, in the same manner as they converged in coming to it ; and if another glass, F o, of the same convexity as DE, be placed in the rays...in the same manner as they came to the first glass. C. There is, however, this difference — all the rays except the middle one have changed sides. T.... | |
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If anoto glass, FG, of the same convexity as DE, be placed in the rays at the same distance from the focus, it will refract them so, as that, after going out of it, they will be all parallel... 
