What is the refractive power of this lens

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Reference no: EM13682855

The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft.

1. What is the refractive power of this lens?

2. What focal length (mm) eyepiece would give a magnification of 1000× for this telescope?

Reference no: EM13682855

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