Physics 122 2/18/11 Prof. E. F. Redish 1 2/18/11 1 Physics 122 2/18/11 2 Physics 122 2/18/11 6 Physics 122 ?Physics 122 2/18/11 Prof. E. F. Redish 2 3/10/10 7 Physics 122 3/10/10 8 Physics 122 2/18/11 9 Physics 122Physics 122 2/18/11 Prof. E. F. Redish 3 2/18/11 10 Physics 122 symbolic “eyes” 2/18/11 11 Physics 122 mirror ordinary object 2/18/11 12 Physics 122 object Virtual image of the object equal distance along perpendicularPhysics 122 2/18/11 Prof. E. F. Redish 4 2/18/11 14 Physics 122 2/18/11 20 Physics 122Physics 122 2/18/11 Prof. E. F. Redish 5 2/18/11 21 Physics 122 3/10/10 22 Physics 122 center of sphere All rays satisfy the “angle of incidence = angle of reflection” measured to the normal to the surface All rays through the center strike the mirror perpendicular to the surface and bounce back along their incoming path. A few rays are easy to figure out where they go. 3/10/10 23 Physics 122 center of sphere All rays satisfy the “angle of incidence = angle of reflection” measured to the normal to the surface The ray hitting the central line of the diagram is particularly simple. A few rays are easy to figure out where they go.Physics 122 2/18/11 Prof. E. F. Redish 6 3/10/10 24 Physics 122 center of sphere A few rays are easy to figure out where they go. All rays parallel to and near an axis of the sphere reflect through a single point on the axis (the focal point) All rays satisfy the “angle of incidence = angle of reflection” measured to the normal to the surface 3/10/10 25 Physics 122 center of sphere focal point 3/10/10 26 Physics 122 center of sphere focal
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