AP1200_Ch4_Optics-1LightProp-2007

AP1200_Ch4_Optics-1LightProp-2007 - AP1200 4. Optics...

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1 AP1200 – 4. Optics Concepts AP1200 – 4. Optics Concepts 4.1 Light Properties 4.1 Light Properties Michel A. Van Hove Michel A. Van Hove WARNING: PRINTING THIS DOCUMENT WILL USE MUCH INK AND WILL NOT SHOW ANIMATIONS.
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2 Learning objectives for optics Learning objectives for optics You should become able to: describe the physical laws governing optics explain the relevance of optics to atmospheric effects and lens systems calculate basic properties of lens systems 9
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3 Further reading and research Further reading and research You will find many learning tools, including Java applets (interactive on-line demonstrations), at: http://www.merlot.org/ at top right, enter search keywords (e.g. optics) http://hyperphysics.phy-astr.gsu.edu/hbase/ligcon.html#c1 contains many useful explanations and illustrations about light, optics and vision http://webphysics.ph.msstate.edu/javamirror/optics-geometric.htm contains many applets about optics Consult our lecture notes, and the recommended textbooks More web links are provided in these Powerpoint files 5
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4 Warning: copyright Warning: copyright Most of the images shown here were downloaded from the web, without asking owners/authors: The owners/authors included no ban on use Copyright must still be respected: The images can be used for educational purposes only; we/you may not make money with them 7
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5 Optics deals with light propagation Optics deals with light propagation mirrors lenses: eye camera atmospheric effects: rainbow mirage 8
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6 Optics treats light as rays, not waves Optics treats light as rays, not waves Light is an electromagnetic wave: There are various kinds of optics: visible-light optics, x-ray optics, electron optics We limit ourselves here to visible-light optics Optics describes light as rays instead of waves: Light propagation is simplified (approximated) as rays = lines Rays move as straight lines, unless reflected or refracted when reflected or refracted, rays turn suddenly or gradually but reflection and refraction are governed by wave properties Wave interference is normally ignored: no standing waves, etc. Diffraction is neglected: rays don’t turn around corners (so shadows are sharp) Strictly, the ray treatment is a short-wavelength approximation: all objects are assumed large compared to the wave length, so diffraction is negligible 6
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7 Light properties Light properties Light is electromagnetic radiation: light combines electric and magnetic fields light needs no medium to propagate light propagates in vacuum, gases, liquids and solids the visible part of the electromagnetic spectrum is a very small part of the complete spectrum 5
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8 The v The v isible part of the electromagnetic spectrum isible part of the electromagnetic spectrum nanometer (10-9m) 8
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9 Light properties Light properties Speed of light The speed of light in vacuum is extremely large:
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This note was uploaded on 01/11/2011 for the course AP 1200 taught by Professor Michela.vanhove during the Spring '10 term at City University of Hong Kong.

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AP1200_Ch4_Optics-1LightProp-2007 - AP1200 4. Optics...

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