A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 372
be truly or exactly centred when its optical centre is situated Into how many classes may lenses be divided ?How are they distinguished ? What names are given to the different varieties of convex lenses tWhat to the three forms of concave lenses ? According to what circumstances in their… … at a point on the axis equally distant from corresponding parts ofthe surface in every direction; as then objects seen through thelens will not appear altered in position when it is turned roundperpendicularly to its axis. 113. The general effect of those glasses which are styled con-vex lenses, or…
Physics
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