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  1. V

    Optics question

    First one.
  2. V

    Optics question

    yeah, I'm having trouble figuring out how I can get that very small airy disc size to correspond to resolution on the Earth's surface, 100km's away. I tried using this where di is distance to the image from the lens, and do is distance to the object. But, then I get a very small number and if i...
  3. V

    Optics question

    So I'm looking for a dimensionless number? Not sure what it could be, i'm only given lens diamater, focal length and wavelength.
  4. V

    Optics question

    Yeah, how do I figure out the res on the Earth? I know the Focal length and orbital height. I was thinking you could just multiply the airy disk size by 100000 for 100km
  5. V

    Optics question

    If I have a camera orbiting in space way above the Earth, and it has a diffraction limited resolution of 4.1*10^-7 m (diameter of airy disc), then how can I find out the corresponding value if the lens is supposed to take images of the Earth?
  6. V

    Polarization question

    Hi all.. I don't understand polarisation. When unpolarised light is passed through a polarizer, the result is linearly polarised light with the E field oscillating in a direction parallel to the transmission axis of the polarizer. Say it passes through another sheet (analyzer) with its...
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