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33 sphericalLenses

33 sphericalLenses - Summary of Lecture 32 Spherical...

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Craig Ogilvie 11 Summary of Lecture 32 § Spherical mirrors: concave, convex § Images are formed when light rays appear to originate from a common point 1. draw optics diagram, reflect about normal, find image 2. often convenient to use “principal” rays 3. calculate s’ image location with mirror equation s’ distance mirror to image f s s 1 ' 1 1 = + s s ' size object vertical size image vertical m - = =
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Craig Ogilvie 22 Goals § Today concepts, physics of spherical lenses § Friday Problem-solving with spherical lenses
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Craig Ogilvie 33 Spherical Lenses § Light refracts when it enters material of different index n converging lens , object at infinity forms a real image at F2 (observer sees rays appearing to originate from point F2) Striking!, the image is in front of the lens (Tue recitation) focal length: distance from lens, f > 0
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Craig Ogilvie 44 Spherical Lenses (II) diverging lens, object at infinity forms a virtual image at F2 (observer sees rays as if coming from point F2) focal length, f < 0
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Craig Ogilvie 55 Principal Rays: Thin lens § Task, by yourself: draw principal rays to find location of image 1) parallel to axis => refracts through focus 2) through center 3) through focus => refracts parallel to axis f f
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