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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.

Question:
(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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The expert determines the objective lens length and focal length.

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Anwesha Ghosh, MSc
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  • MSc, Indian Institute of Technology - Roorkee (I.I.T.-ROORKEE)
  • BSc, Banaras Hindu University
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