 | Jeremiah Joyce - 1809 - 290 էջ
...Parallel lines are those which being infinitely extended never meet. Charles. How do you describe a lens r Tutor. A lens is . a glass ground into such a form...names; They are represented here in one view, (Plate i. Tig. .7..) A is such a one as that in the last figure, and it is called a plano-convex, because one... | |
 | William Nicholson - 1809 - 684 էջ
...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 - 1811 - 516 էջ
...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 - 1811 - 196 էջ
...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... | |
 | Encyclopaedias, John Millard - 1813 - 712 էջ
...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... | |
 | John Millard - 1813 - 704 էջ
...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... | |
 | Visit - 1819 - 252 էջ
...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,... | |
 | William Nicholson - 1821 - 406 էջ
...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... | |
 | Alexander Jamleson - 1821 - 456 էջ
...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... | |
 | Luke Herbert - 1824 - 394 էջ
...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... | |
| |
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. 
