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JEE Main & Advanced Physics Ray Optics Question Bank Critical Thinking

  • question_answer
    Two point white dots are 1mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which dots can be resolved by the eye ? [Take wavelength of light = 500 nm]  [AIEEE 2005]

    A)            6 m                                           

    B)            3 m

    C)            5 m                                           

    D)            1 m

    Correct Answer: C

    Solution :

               \[\frac{1.22\,\lambda }{a}=\frac{x}{d}\Rightarrow d=\frac{x\times a}{1.22\,\lambda }\]\[=\frac{1\times {{10}^{-3}}\times 3\times {{10}^{-3}}}{1.22\times 500\times {{10}^{-9}}}\]= 5m


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