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A Guide on Choosing the Best Telescope Eyepieces in 2023 | OPT Telescopes
The magnifying power of a telescope is 9. When it adjusted for parallel rays, the distance between the eyepiece and objective lens is 20cm. What is the focal length of both lenses? -
Refractive Telescopes
A Guide on Choosing the Best Telescope Eyepieces in 2023 | OPT Telescopes
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