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LENSES AND MIRRORS 105
Collector Lois
(15) The lens of a 2-lens condenser that is next to the light source and therefore collects the light.
Compound Lens
(16) An assemblage of lenses mounted to form one lens.
Conjugate Foci
(17) A term having reference to two points, one of which is the light source or an object, the other the point at which the image of such light source or object is formed. It is the distance of the optical center of the lens from each of these points. If the distance to one of these points is altered, the other also is automatically altered. If one is moved nearer the lens the other will automatically be moved further away.
Converging Lens
(18) The lens of a 2-lens condenser that is located farthest away from the light source. The lens that converges the light upon the projector aperture and cooling plate. The prismatic condenser and the mirror, when used, act as both collector and converger, except where a mirror is used in conjunction with a lens, as is done in one equipment.
Condenser
(19) In projection optics, a lens or combination of lenses by means of which rays from the light source are collected and converged upon the projector aperture and cooling plate.
Chromatic Aberration
(20) An uncorrected lens, or an improperly corrected lens that tends to separate white light into its component elements or colors, focusing the colors at different distances from the optical center of the lens. This fault is corrected by combining lenses of crown and flint glass having convex and concave surfaces. In other words positive and negative lenses.