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JEE Main & Advanced Sample Paper JEE Main Sample Paper-39

  • question_answer
    Astronauts look down on earth surface from a space ship parked at an altitude of 500 km. They can resolve objects of the earth of the size (It can be assumed that the pupils diameter is 5mm and wavelength of light is 500 nm)

    A)  0.5 m                         

    B)  5 m

    C)  50 m                          

    D)  500 m

    Correct Answer: C

    Solution :

     Resolving power of eye\[=\lambda /a\]\[=\frac{500\times {{10}^{-9}}}{5\times {{10}^{-3}}}={{10}^{-4}}\]radians Now, arc = angle x radius \[={{10}^{-4}}\times (500\times {{10}^{3}})m=50m\]


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