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BCECE Engineering BCECE Engineering Solved Paper-2014

  • question_answer
    A small laboratory telescope has an objective   lens of focal length 140 cm and an eye-piece of focal length 6 cm. Then, separation between the objective and eye-piece is        

    A) 140cm                    

    B) 24cm                                                                           

    C) 156cm                    

    D) 146cm                                                                        

    Correct Answer: D

    Solution :

     Separation between objective and eye-piece is \[L={{f}_{o}}+{{f}_{e}}\] \[\therefore \]  \[L=140+6=146cm\]


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