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J & K CET Engineering J and K - CET Engineering Solved Paper-2013

  • question_answer
    The distance of moon form the earth is \[3.8\times {{10}^{5}}\text{ }km\]. Supposing that the eye is most sensitive to the light of wavelength \[550\text{ }nm,\] the separation of two points on the moon that can be resolved by a \[500\text{ }cm\]telescope is

    A)  \[50\,\,m\]               

    B)  \[55\,\,m\]

    C)  \[51\text{ }m\]                

    D)  \[60\,\,m\]

    Correct Answer: B

    Solution :

    Resolving power \[=\frac{D}{1.22\,\lambda }\] Given,  \[D=3.8\times {{10}^{5}}km=3.8\times {{10}^{8}}m\] \[\lambda =550nm=550\times {{10}^{9}}m\] \[\Rightarrow \]\[RP=\frac{3.8\times {{10}^{8}}}{1.22\times 550\times {{10}^{9}}}=55m.\]


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