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  • Created by: Elene
  • Created on: 30-11-12 20:47
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  • Imaging
    • A wave of frequency(f) travelling at speed(v) has a wavelength of  ( ?)   given by v =f x  ?
      • Time Period = 1/frequency and vice versa
    • Time Period = 1/frequency and vice versa
    • Images can be formed with many kinds of signals, including ultrasound and all parts of the electromagnetic spectrum
      • E.g. Infrared satellites are able to track growth of vegetation
    • Images can be recorded electronically by micro sensors such as the charge coupled device(CCD)
    • Images on an atomic scale recorded by scanning methods  such as scanning tunneling microscope
    • Images can be stored as an array of pixels,each defined by a number(binary)
    • Quantities that cover a large ranges of values can usefully be displayed on a logarithmic scale.
      • Prefixes of scientific units(e.g. micro, milli, kilo, mega) are chosen at multiples of 1000.
      • 1 Bit of information is two choices(1 or 0); 1 byte of info contains 8 bits (256 alternatives);  amount of info/ provides N=2^i alternatives
    • The eye is like a video camera, sending out a stream of processed signals through detection of edges and movements.
      • A converging lens (positive distances)  adds a constant curvature to light falling on it. The curvature added is the power of the lens.
        • Power of Lens= 1/f
        • Image and object distances  1/v = 1/u +1/f
          • v = image distance  u=object distance (initial image) f= focal length(lens adds this)
        • Refractive index = speed of light in a vacuum/speed of light in a material
      • Linear magnification is  m=  image height/object height
      • Light takes the same time to travel on all paths from a point on the source to the image via lens or mirror


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