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What is the physical diameter of the first optical element in the telescope?(a) Optical aperture(b) Field of view(c) Effective focal length(d) Light detector |
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Answer» Correct choice is (a) Optical aperture To explain I would say: Each design of a telescope is characterized by an optical aperture, an effective focal length, and a field of view. The optical aperture is the physical diameter of the first element in the telescope. |
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