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  Questions about Optics
     
Electro-Magnetic Radiation   The Electro-Magnetic Spectrum
    Michelson’s Method for Measuring the Speed of Light
     
Reflection and Refraction   Reflection of Light
    The Law of Reflection
    Image Formation by a Plane Mirror
    Refraction of Light
  Optical Density and Refractive Index
    Real and Apparent Depth
    Refraction of Light by Prisms
    Total Internal Reflection
    Reflection of Light by Prisms
    Optical Fibres
     
Lenses   Ray Diagrams for Lenses
    Ray Diagrams for Lenses: Examples
  The Focal Length of a Converging Lens
    The Power of a Lens
    The Lens Equation
    Defects of Lenses:
   
Spherical Aberration
Chromatic Aberration
    Angular Magnification Produced by a Simple Microscope
    Angular Magnification Produced by an Astronomical Telescope
    Resolving Power of an Optical Instrument
 
Thin Film Interference   Interference in Wedge Shaped Films
    Interference in Parallel Sided Thin Films
   
 
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These pages were contributed by David Hoult BSc(just), PiS (retired).
Mr Hoult supports a number of animal welfare groups, including:
Compassion in world farming Campaigns against “factory farming” and long distance animal transport.
Branches in UK, USA, France, Italy and many other countries.
L214 Multiple animal welfare campaigns (in France).The name L214 comes from the reference of a law which finally accepted that animals are sentient beings, capable of having feelings and hence capable of suffering.
Comité Radicalement Anti-Corrida Against the barbaric practice of bull “fighting” (or bull torturing to give it a more apt description).
Stop Gavage Against force feeding (gavage) of ducks and geese for foie gras.
Welfarm (formerly Protection Mondiale des Animaux de Ferme, PMAF) French organization having the same aims as CIWF: against “factory farming” and long distance animal transport.
People for the Ethical Treatment of Animals Campaigns especially against the fur trade but also many other animal cruelty issues.
Please consider helping to improve the miserable existence of animals raised for meat, leather, fur etc and to finally put end to the barbaric practice of bull “fighting”.
Thank you.