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OPTI 201R L26-3

OPTI 201R L26-3 - 255 Cardinal Points of Spherical Mirrors...

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OPTI 201R Fall 2009 255 Cardinal Points of Spherical Mirrors: Concave: Figure 8.10 Single reflecting spherical concave surface in air. Convex: ? "Pop Quiz": Draw a convex mirror and label the cardinal points.

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OPTI 201R Fall 2009 256 Figure 8.13 Convex negative power and concave positive power spherical mirrors: (a) convex; (b) concave. NOTE: A mirror is a perfect equivalent of a thin lens (so the principal points are at the vertex).
OPTI 201R Fall 2009 257 Ray Tracing a Spherical Mirror: Use 3 special rays (that all leave the top point of the object): Figure 8.11 Using selected rays to find the image location. ! The ray that is parallel to the optical axis , after reflection, passes through the back focal point F*. ! The ray that passes through the front focal point F , after reflection, is parallel to the optical axis. ! The ray that passes through the center of curvature, cc , after reflection, passes through the center of curvature. The intersection of these 3 rays locates the top point of the image (this point is conjugate to the top point of the object). (The bottom point of the image is found by drawing a line normal to the optical axis.) These 3 rays determine the image: ! height ! location (real vs. virtual) ! orientation NOTE: Any 2 of these rays are actually needed.

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