| Laws of geometrical optics
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| Introductory Geometrical optics - a chapter from a lecture course. Geometrical optics - from Encyclopedia Britannica. Geometrical optics - from Mobius laser archive. .  | Advanced
topics  Optical properties of materials - from Almaz Optics. Hamilton's Papers on Geometrical Optics - online archive.  | ||
| Lenses and their applications
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| Introductory Geometri cal optics II : applications - oline lecture course. Lenses, mirrors and Prisms - a chapter from tutorial Light and Optics. Refraction and the Ray model of light - very detailed lecture course; lenses. Reflection and the Ray model of light - very detailed lecture course; mirrors. Prisms - very impressive Java applet. .  | Advanced
topics  Molecular expressions - an excellent site devoted to microscopy: galleries, history, personals, and wonderful selection of Java applets. Optical aberrations - a part of the above site. Lens Design - encyclopedic site on lenses and lens systems. Optical fibres - how light behaves in an optical fibre. The Ronchi Test - testiing of optical systems.  | ||
| Geometrical optics in the Outdoors
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| Introductory The mathematics of rainbow - a lecture course. Mirage - mirages and their causes. .  | Advanced
topics  | ||