The objective lens of the refracting telescope at the lick
The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft.
What is the refractive power of this lens?
What focal length (mm) eyepiece would give a magnification of 1000x for this telescope?
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the objective lens of the refracting telescope at the lick observatory in california has a focal length of 57 ftwhat is
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