OPTI 201R 10 L16 - 16-1 6.2 Gaussian OpticsCardinal Points for a(Thin Lens A lens(in general any optical system has 6 cardinal points front focal

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OPTI 201R Fall 2010 16-1 6.2 Gaussian Optics—Cardinal Points for a (Thin) Lens ! A lens (in general, any optical system) has 6 cardinal points: ! Each of these points lies on the optical axis. ! “Front” refers to the object-space (“input”) side of the surface or optical system (light traveling from left to right) ! “Back” refers to the image-space (“output”) side of the surface or optical system (light traveling from left to right) ! Essential in describing a “thick” (real) lens (Ch. 7) ! Useful in understanding a thin lens…. ! The cardinal points are the basis for understanding Gaussian imaging. front focal point F back focal point F * front principal point P back principal point P * front nodal point N back nodal point N *
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OPTI 201R Fall 2010 16-2 ! “A ray from infinity and parallel to the axis in one space will refract (or reflect) into the adjacent space after passing through (or reflecting from) an optical surface.” ! “The focal point is defined as the point at which this refracted (reflected) ray crosses the optical axis.” parallel ray in object space ! image space of the surface ! F * parallel ray in image space ! object space of the surface ! F ! The principal plane is defined as the plane where this refraction (or reflection) takes place. ! In Gaussian optics, object and image distances are measured from the principal points.
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This note was uploaded on 08/23/2010 for the course OPTICS 201R taught by Professor Staff during the Spring '10 term at University of Arizona- Tucson.

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OPTI 201R 10 L16 - 16-1 6.2 Gaussian OpticsCardinal Points for a(Thin Lens A lens(in general any optical system has 6 cardinal points front focal

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