It is desired to make a 3-mdiameter parabolic telescope mirror by rotating molten glass in rigid-body motion

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It is desired to make a 3-mdiameter parabolic telescope mirror by rotating molten glass in rigid-body motion until the desired shape is achieved and then cooling the glass to a solid. The focus of the mirror is to be 4 m from the mirror, measured along the centerline. What is the proper mirror rotation rate, in rev/min?

It is desired to make a 3-mdiameter parabolic
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