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GeomOpt_Part22 - Reflectingsystems Reflecting Mirrors...

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Reflecting systems • Mirrors • Beam deflection • Concave and convex mirrors focal length and ray behaviour • Y nu ray tracing with mirrors • Reflecting prisms References: Hecht 5.4 ©AGK 2010 Geometric optics II. 81
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Learning outcomes After taking this section you should be able to: • Sketch rays in reflecting system • Unfold system for analysis J tif h f b li i • Justify shape of parabolic mirror • Calculate focal length of curved mirrors • Calculate imaging properties of curved mirror • Explain circumstances in which reflecting systems may be preferred • Suggest applications for reflecting prisms ©AGK 2010 Geometric optics II. 82
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Mirrors Planar or curved reflecting devices F t b k fl ti Front or back reflecting Useful in broadband or extreme wavelength systems Why does a mirror invert left right but not up down ? ©AGK 2010 Geometric optics II. 83
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Reflected image S Mirror object ©AGK 2010 Geometric optics II. 84
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Reflected image S P s o s i Mirror object virtual image V ©AGK 2010 Geometric optics II. 85
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Extended Object S P s o s i Mirror object virtual image V ©AGK 2010 Geometric optics II. 86
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Mirror inversion l h object r h image ©AGK 2010 Geometric optics II. 87
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Mirror rotation   2 i r i i i + 2 r R t ti f i b l f lt i b d fl ti • Rotation of mirror by angle of results in beam deflection by 2 • Applications in scanners, choppers, galvanometers ©AGK 2010 Geometric optics II. 88
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©AGK 2010 Geometric optics II. 89
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Scanner Light source Object Scan lens Scan mirror ©AGK 2010 Geometric optics II. 90
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Scanner: 3D view • Applications: – Laser printers – Bar code readers F hi – Fax machines – Photocopiers ©AGK 2010 Geometric optics II. 91
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Rotation Light source Scan lens Object Scan mirror ©AGK 2010 Geometric optics II. 92
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