1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Optics Problem( me)

  1. Dec 16, 2008 #1
    Optics Problem( plzz help me)

    Consider a telescope with an aperture of 18 inches and focal length of 120 inches.
    what is the diameter of the star imaged in focal plane of telescope? Take the image diameter to be associated with the first minimum in the diffraction pattern of the image. Use wavelength of 550nm.

    Hint: By Using lens diffraction theory.
     
  2. jcsd
  3. Dec 16, 2008 #2

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    Re: Optics Problem( plzz help me)

    What is the equation for diffraction at a circular aperture?
     
  4. Dec 16, 2008 #3
    Re: Optics Problem( plzz help me)

    hiiiiiiii friend.,

    for the circular aperture

    U= C exp(ikr) * integral of Exp(ikysin@) 2sqrt(R^2-Y^2) dy
    bet ween the limits (-R,R)
     
    Last edited: Dec 16, 2008
  5. Dec 16, 2008 #4

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    Re: Optics Problem( plzz help me)

    The nice Mr Rayleigh solved it for you
     
  6. Dec 20, 2008 #5
    Re: Optics Problem( plzz help me)

    In other words 1.22 times wavelength divided by aperture diameter for the half angular width of the central maxima.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Optics Problem( me)
  1. Optics Problems (Replies: 2)

  2. Optics Problems (Replies: 1)

  3. Modern Optics problems (Replies: 17)

Loading...