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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. "
Scientific Dialogues: Intended for the Instruction and Entertainment of ... - Page 47
by Jeremiah Joyce - 1809
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The British Encyclopedia, Or Dictionary of Arts and Sciences ..., Volume 5

William Nicholson - 1809
...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...
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Pocket Encyclopedia: Or, A Dictionary of Arts, Sciences, and ..., Volume 3

Edward Augustus Kendall - 1811
...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...
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An Easy Grammar of Natural and Experimental Philosophy: For the Use of Schools

Sir Richard Phillips - 1811 - 152 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...
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The New Pocket Cyclopædia: Or, Elements of Useful Knowledge, Methodically ...

John Millard - 1813 - 645 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...
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The New Pocket Cyclopaedia: Or, Elements Or Useful Knowledge, Methodically ...

John Millard - 1813 - 671 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...
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Of optics, magnetism, electricity, & galvanism

Jeremiah Joyce - 1815
...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 Ğuch a one as that in the last figure, and it is called a plano-convex, because one...
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A visit to the manor house; or, The twelve days at Christmas, By a lady

Visit - 1819
...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,...
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Universal Science Or the Cabinet of Nature and Art, Comprising ..., Volume 2

Alexander Jamleson - 1821
...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...
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American Edition of the British Encyclopedia: Or, Dictionary of ..., Volume 9

William Nicholson - 1821
...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...
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Register of Arts, and Journal of Patent Inventions, Volume 1

Luke Herbert - 1824
...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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