An Astronomical Telescope Has an Objective Lens with Focal Length

question 28

Multiple Choice

An astronomical telescope has an objective lens with focal length f_o and has an eyepiece with focal length f_e.A second telescope has objective and eyepiece lenses with quadruple the focal length of the first telescope.Which telescope gives the greater magnification and by what factor?

• A)The first telescope gives 16 times the magnification of the second.
• B)The second telescope gives 16 times the magnification of the first.
• C)Both telescopes give the same magnification.
• D)The actual focal lengths must be known to answer this question.
• E)​The second telescope gives 4 times the magnification of the first.

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