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Homework Help: Finding the angular resolution of a telescope

  1. Mar 22, 2015 #1
    1. The problem statement, all variables and given/known data

    An optical telescope has a diameter of 1.5m. It is placed at a site with 'seeing' of 1.0''. What is the expected resolution in arcseconds from observations made with the telescope at 1000nm? Give your answer to one decimal place

    2. Relevant equations

    Theta (rads) = 1.22 * (wavelength/diametre of aperture)

    Rads * 180/pi = degrees

    1 degree = 1*60*60 arcseconds

    3. The attempt at a solution

    So far, I have used the equation:

    Theta = 1.22 * (wavelength / D) (where D = diametre of aperture).

    Thus using this equation I have worked out that: 1.22 * (1000 * 10-9 / 1.5) = 813.33 * 10-9 rads = 0.167 arcseconds.

    Where does seeing come into all this?? Its driving me mad!
  2. jcsd
  3. Mar 22, 2015 #2


    User Avatar
    2017 Award

    Staff: Mentor

    Do you know how seeing is defined?

    Both seeing and the telescope resolution will influence the angular resolution, unless one is negligible it is probably reasonable to combine their effects.
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