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BHU PMT BHU PMT (Mains) Solved Paper-2011

  • question_answer
    An astronomical telescope has an eye-piece of focal length 5 cm. If the angular magnification in normal adjustment is 10, the distance between the objective and the eye-piece in cm is

    A)  2                                            

    B)  45   

    C)  50                                         

    D)  55

    Correct Answer: C

    Solution :

                     \[M=\frac{\beta }{\alpha }\] \[M=\frac{{{f}_{o}}}{{{f}_{e}}}\] \[10=\frac{{{f}_{o}}}{5}\] \[\Rightarrow \]               \[{{f}_{o}}=50\,cm\]


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