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JEE Main & Advanced Physics Ray Optics Question Bank Microscope and Telescope

  • question_answer
    A telescope of diameter 2m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image is just resolved by this telescope is  [MP PET 2003]

    A)            \[4\times {{10}^{-4}}\]rad     

    B)            \[0.25\times {{10}^{-6}}\]rad

    C)            \[0.31\times {{10}^{-6}}\]rad                                           

    D)            \[5.0\times {{10}^{-3}}\]rad

    Correct Answer: C

    Solution :

                       Minimum angular separation \[\Delta \theta =\frac{1}{R.P.}=\frac{1.22\ \lambda }{d}\]            \[=\frac{1.22\times 5000\times {{10}^{-10}}}{2}=0.3\times {{10}^{-6}}rad\]


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