 | William Nicholson - Natural history - 1809 - 684 pages
...of the same ray CF after it is refracted ; thus the angle LCF is the angle of deviation. A lem, is glass ground into such a form as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names. A plano-convex, has one side... | |
 | Edward Augustus Kendall - Encyclopedias and dictionaries - 1811 - 516 pages
...one is seen by refraction through the water, the other by the rays after refraction at tb,e surface. A lens is a glass ground into such a form as to collect...disperse the rays of light which pass through it. , There an: various kinds of lenses, named according to their forms. A plano-convex lens has one side... | |
 | Sir Richard Phillips - Celestial mechanics - 1811 - 196 pages
...refraction through the water, the other by the rays after refraction at the surface. 199. A lens \aa glass ground into such a. form as to collect or disperse the rays of light which pass through it. 200. There are various kinds of lenses, named according to their forms. 201. A plano-convex lens has... | |
 | John Millard - Handbooks, vade-mecums, etc - 1813 - 704 pages
...against a surface, and are sent back again from the surface, they are said to be reflected. A lens is glass ground into such a form, as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names. A planoconvex has one side... | |
 | Encyclopaedias, John Millard - Children's encyclopedias and dictionaries - 1813 - 712 pages
...against a surface, and are sent back* again from the surface, they are said to be reflected. A lens is glass ground into such a form, as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names. A planoconvex has one side... | |
 | Jeremiah Joyce - Science - 1815 - 468 pages
...It represents a glass lens, of which there are several kinds. Charles. How do vou describe a lens ? Tutor. A lens is a glass ground into such a form as...names. They are represented here in one view, (Plate i. Fig. 7.) A is «uch a one as that in the last figure, and it is called a plano-convex, because one... | |
 | Visit - 1819 - 252 pages
...in its focus. For the different experiments in optics glasses are ground in a particular manner, so as to collect or disperse the rays of light which pass through them. These glasses are called lens, and are of difi'erent forms, as concave, convex, double concave,... | |
 | Alexander Jamleson - 1821 - 456 pages
...against a surface, and are sent back again from the surface, they are said to be reflected. A lens is glass ground into such a form, as to collect or disperse the rays of light which pass through it. These arc of different shapes, and from thence receive different names. A plano-convex has one side... | |
 | William Nicholson - Natural history - 1821 - 406 pages
...of the same ray CF, after it is refracted ; thus the angle LCF is the angle of deviation. A lens, is glass ground into such a form as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names. A plano-convex, has one side... | |
 | Luke Herbert - Industrial arts - 1824 - 394 pages
...whose centre is the deepest sunk. The sections of these may be curves as various as the last. A lens is glass ground into such a form as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names. A. plano-convex has one side... | |
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A lens is glass ground into such a form, as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names. 
