| qshpang |
2007-05-05 14:30 |
Lens and images
Lens and images `?f<hIJoz
U* uMMb}$
Introduction: Along with mirrors, lens complete the set of simple optical elements. Lens o)$eIu}Wg
have been used for hundreds of years. Galileo constructed the first telescope from a pair of lens `$F B[Z} &
in 1609 and used it to discover, among other things, several of Jupiter’s moons. A lens forms QL2 `X2
images by bending the incoming light as it passes. Image formation can be understood by ?.n1t@sG&
treating the incoming light as rays and using a simple geometric arguments. Like much of basic [Dmf.PUe
physics, this approach isn’t completely correct but is a good approximation. Because of the ",#Ug"| 2
geometric nature of the approximation, one can analyze a lens with geometry. This sort of m=Mk@xfQ#
approach is called ray tracing. In today’s lab, we will form images with lens and analyze the r;E5e]w*-
system with ray tracings and with equations.
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