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JEE Main & Advanced Physics Ray Optics Question Bank Microscope and Telescope

  • question_answer
    Two convex lenses of focal lengths 0.3 m and 0.05 m are used to make a telescope. The distance kept between the two is                                                                      [MNR 1994]

    A)            0.35 m                                     

    B)            0.25 m

    C)            0.175 m                                  

    D)            0.15 m

    Correct Answer: A

    Solution :

               If final image is formed at infinity, then the distance between the two lenses of telescope is equal to length of tube \[={{f}_{o}}+{{f}_{e}}=0.3+0.05=0.35\ m\]


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