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    Determining Objective Lens Length and Focal Length

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    Hi, I need some assistance answering the following questions. I am having some difficulty understanding the concepts.

    (a) How large is the exit pupil of a 7-power telescope having an objective lens 50 mm in diameter?
    (b) If the objective lens is 6 inches in focal length, what must be the focal length of the ocular?
    (c) What focal length ocular should be used with this objective lens in order to produce a telescope having normal magnification for daytime use?

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    Solution Summary

    The expert determines the objective lens length and focal length.