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JEE Main & Advanced Physics Ray Optics Question Bank Mock Test - Geometrical Optics

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

    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 :

    [c] 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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