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| qshpang | 2007-05-05 14:30 |  
| Lens and images
Lens and images HxgH*IMs 5X'com?T
 Introduction: Along with mirrors, lens complete the set of simple optical elements. Lens 5nhc|E)C
 have been used for hundreds of years. Galileo constructed the first telescope from a pair of lens B 3Yj
 in 1609 and used it to discover, among other things, several of Jupiter’s moons. A lens forms CLU[')H0
 images by bending the incoming light as it passes. Image formation can be understood by !{L6
4qI
 treating the incoming light as rays and using a simple geometric arguments. Like much of basic *"%MT:
 physics, this approach isn’t completely correct but is a good approximation. Because of the NyJ=^=F#
 geometric nature of the approximation, one can analyze a lens with geometry. This sort of 'za4c4b*u
 approach is called ray tracing. In today’s lab, we will form images with lens and analyze the 7r_Y.
 system with ray tracings and with equations.
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