Chapter 34a - Image formation Plane mirrors object 111 +=...

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Image formation Plane mirrors p i object virtual image The rays that reflect from the mirror, in the direction of the pupil, extended back, appear to converge from a virtual image at a distance behind the mirror that equals the object distance in front of the mirror, |i| = p . Distances for virtual images are by convention negative so , . i = – p Same size as object. image is upright (as opposed to inverted) Rays of scattered light diverge from each point of the object. 11 1 p if + =
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p i object virtual image Same size as object. image is upright (as opposed to inverted) A real image is one that can be projected onto a screen at some point in space and seen on the screen at that location. A plane mirror can not form a real image in this way but it does produce the virtual image, seeming to exist behind the mirror.
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Spherical mirrors Two general types: Concave (Innie) Convex (Outtie)
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Concave mirrors Radius of curvature r (at C). Parallel rays of light (plane waves) coming in parallel to the CA reflect to a single point , a distance f from c , called the real focus , F . This focal distance is completely determined by radius of curvature r with, Like a plane mirror the concave mirror also forms images , but the location , size and type are distinct from the plane mirror. (CA) Light in and out 1 fr 2 =
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Image location for the concave mirror by ray tracing . From tip of object draw two rays . One parallel to CA (reflection goes through focus) and one through the focus (reflection goes parallel to CA ). CA p i CA p i f Where those rays meet locates the tip of the image. In contrast to the plane mirror, this is a real image (a replica of the object is formed on a screen placed in the image plane).
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This note was uploaded on 03/12/2010 for the course PHY PHY taught by Professor Mueller during the Spring '09 term at University of Florida.

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Chapter 34a - Image formation Plane mirrors object 111 +=...

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