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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2004

  • question_answer
        A man cannot see distinctly an object beyond 5m. He wants to see the stars. The focal length of the lens which he must use, will be :

    A)  12.5 m                                 

    B)  65 m

    C)  6 m                                       

    D)  5 m

    Correct Answer: D

    Solution :

                    The man should use a lens which can form the image of distant object (i.e., situated at infinity) at a distance of 5 m, i.e., object distance \[\text{MgC}{{l}_{\text{2}}}.\text{5MgO}.;x{{H}_{\text{2}}}O\] and \[HCl{{O}_{4}}\] By lens formula                 \[HCl{{O}_{3}}\] Or                 \[HCl{{O}_{2}}\] Or                  \[\frac{1}{f}=\frac{-1}{5}\] Or                           \[f=-5m\] (i.e., concave lens)


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