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GeomOpt3

# GeomOpt3 - Section3.Lenscombinations Section...

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Section 3. Lens combinations References: Hecht 5.2 ©AGK 2010 Geometric optics 1: Lenses and lens combinations 69

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Overview Most optical systems contain more than one lens. In this l ill i d i l i f class we will introduce some simple equations for combinations of pairs of lenses. This will also allow us to study some of the terms that are used to describe compound optical systems, which we will relate to real instruments such as telescopes and microscopes. ©AGK 2010 Geometric optics 1: Lenses and lens combinations 70
Learning outcomes • Justify derivation of compound lens equations • Apply compound lens equations • Define front focal length, back focal length and effective focal length • Calculate these quantities (bfl and ffl) ©AGK 2010 Geometric optics 1: Lenses and lens combinations 71

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Thin lens review S S 2 P 1 y o F F i O A W 1 P 2 y i o x o f f x i s s REVIEW o i 1 1 1 1 1 1 l n f s s R R 1 2 o i ©AGK 2010 Geometric optics 1: Lenses and lens combinations 72
Optics Bench applet ©AGK 2010 Geometric optics 1: Lenses and lens combinations 73 http://webphysics.davidson.edu/physlet_resources/optics4/default.html

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Thin lens combinations • Most optical systems contain several lenses, which may b b h i i d i be both positive and negative • We need to be able to calculate location and magnitude of image • When there are more than 2 or 3 lenses it is easier to use a computer or the matrix formulation (see later) • However, we will study formulae for 2 lens systems ©AGK 2010 Geometric optics 1: Lenses and lens combinations 74