lecture17

Fundamentals of Physics, (Chapters 21- 44) (Volume 2)

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Unformatted text preview: Chapter 34: Images Monday, August 6, 2007 Plane Mirror Rays from O reflect on the surface of the plane mirror. Extending the rays beyond the surface of the mirror, they meet at I , where the imaginary image is located behind the mirror. I O represents the object I P represents the distance from the object to the surface of the mirror I I is the image of this object I i represents the distance from the surface of the mirror to the image Focal Points A focal point is a point at which rays coming from infinity meet. The focal length is the distance between a focal point and the cen- ter of the lens or mirror. Finding the Image To find the location of an image in all cases (for lenses and mirrors of all types), we need to know how at least two rays of light originating from the object travel through the lens or mirror. We use the following rules to help us: I A ray travelling parallel to the axis of the lens or mirror will bounce off the lens/mirror and go towards the real focus (or be extended in that direction). I A ray travelling through the central axis will continue travelling through, undeflected. I A ray travelling through the focal point, after hitting the lens or mirror, will travel parallel to the central axis. Spherical Mirrors A portion of a sphere coated with a reflective material on the outside is called a concave mirror. A portion of sphere coated on the inside is called a convex mirror. When a mirror is made of spheres of radius r , the focal length of the mirror is equal to r / 2....
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lecture17 - Chapter 34 Images Monday August 6 2007 Plane...

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