OPTICS
Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves and radio waves, exhibit similar properties.
Most optical phenomena can be accounted for using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics, treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive model of light, which includes wave effects such as diffraction and interference that cannot be accounted for in geometric optics. Historically, the ray-based model of light was developed first, followed by the wave model of light. Progress in electromagnetic theory in the 19th century led to the discovery that light waves were in fact electromagnetic radiation.
Some phenomena depend on the fact that light has both wave like and particle -like properties. Explanation of these effects requires quantum mechanics. When considering light’s particle-like properties, the light is modelled as a collection of particles called “photons”. Quantum optics deals with the application of quantum mechanics to optical systems.
Optical science is relevant to and studied in many related disciplines including astronomy, various engineering fields, photography and medicine. Practical applications of optics are found in a variety of technologies and everyday objects, including mirror, lenses, telescopes, microscopes, laers and fibre optics.
We have a large number of very interesting optics in our next sale on Saturday 12th August 2017. Our catalogue will be available soon.
Lot 193 – Carl Zeiss Brass Jena Tele Tubus III Large format lens rear lens No 587 with Ross London Planar 1;4 205mm Zeiss Patent front lens. £40 – £80.
Lot 239 – Small wooden cased student microscope with objectives, slides etc. £10 – £20.
Lot 180 – British Military issue AFV binocular/periscope (open length 32cm). £40 – £80.
Lot 190 – Leather cased Brass Military telescope Marked TEL.S.I.G. Regt MKIV BroadHurst Clarkson London 1918 34152, complete with belt and covers (open length 95cm). £40 – £80.
Lot 181 – Barr And Stroud British 7x CF41 Military Binoculars, cased.
Lot 187 – A collection of early unbranded telescopes together with similar small field microscope (9)
Lot 183 – British Military Issue W. Ottway prismatic monocular Naval gun sighting telescope (45cm length) pattern G354.
Lot 182 – WW2 British Military Issue Brass Trench Periscope no 14 TPL MK4 By R&J Beck Ltd With Screw Off wooden handle.
Lot 184 – WW1/WW2 Era British Military Telescope By Broadhurst Clarkson & Co London , closed length 27cm (open length 76cm)
Lot 185 – Heavy Brass Military Tank Gun sight, unbranded.
Lot 186 – 1914 Presentation Telescope awarded to by training college HMS Worcester for proficient use of the sextant to JJ Craig 1914, Telescope made by H Hughes and Sons Ltd London (open length 58cm)
Lot 188 – Leather cased Brass Military telescope Marked TEL.S.C.T. Regt mk2 21326 os 126.GA K.E.C (open length 76cm)
Lot 189 – WW1/WW2 Era British Military Telescope By Broadhurst Clarkson & Co Ltd Bristol and Cardiff, complete with belt and covers (open length 82cm)
Lot 191 – Leather cased Brass Military telescope Marked Aitchison London The Tartget No 5909 (open length 77cm)
Lot 192 – WW1 Leather and Brass Telescope Marked Tel Sig (MKIV also GS , R&J Beck Ltd London 1915 No 4605 (open length 92cm)
Lot 194 – A collection of Military Optic Parts including Periscope parts, Eyepieces etc.
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