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Unformatted text preview: Lecture 6 1 © Jeffrey Bokor, 2000, all rights reserved Lecture 6 Stop and Apertures [Reading assignment: Hecht 5.3] Aperture Stop Every optical system has some component that limits the light cone that is accepted from an axial object. Simple case - single lens • Entrance pupil: Image of the aperture stop as seen from the object side. Defines the cone of light accepted by the optic. The importance of the entrance pupil is that the brightness of the image depends on this cone angle. The larger the acceptance angle, the more light that is collected from each object point, and hence the brighter the image. AS AS could be a physical aperture placed somewhere in the optical path. could be the diameter “clear aperture” of the lens. entrance pupil Lecture 6 2 © Jeffrey Bokor, 2000, all rights reserved • Exit pupil: Image of the aperture stop, as seen from the image side of the optic. The exit pupil defines the cone angle of light converging to the image point. Later, we will see that thisThe exit pupil defines the cone angle of light converging to the image point....
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- Spring '09
- entrance pupil, Jeffrey Bokor