Lens and images -
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Introduction: Along with mirrors, lens complete the set of simple optical elements. Lens k'|yUJ,
have been used for hundreds of years. Galileo constructed the first telescope from a pair of lens (!5Pl`:j"
in 1609 and used it to discover, among other things, several of Jupiter’s moons. A lens forms fU
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images by bending the incoming light as it passes. Image formation can be understood by Or?c 21un
treating the incoming light as rays and using a simple geometric arguments. Like much of basic =`|Bo fR
physics, this approach isn’t completely correct but is a good approximation. Because of the HH7WM YoKY
geometric nature of the approximation, one can analyze a lens with geometry. This sort of j2IK\~W?-
approach is called ray tracing. In today’s lab, we will form images with lens and analyze the 1 ; <Vr <.
system with ray tracings and with equations.
