What is the minimum lens size (in meters) that will permit just resolving 2 stars 1.1 second apart using light of 510nm?

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  1. Limiting resolution (in radians)
    = 1.22 (wavelength)/(diameter)

    1.1 arc second = [1.1 sec/(3600 sec/deg*)]*1 rad/57.3 deg = 5.33*10^-6 rad

    5.33*10^-6 = 1.22*510*10^-9/D

    Solve for diameter D

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  2. Is D~11.7*10^-2

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  3. i solved D~11.7*10^-2, but the answer key is .0956

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