What is the refractive power of this lens

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Reference no: EM13323195

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?

Reference no: EM13323195

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What is the refractive power of this lens : 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

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