Spherometer
thingiverse
A Curvature Measurer is engineered to calculate the degree of curvature of a celestial mirror. As a direct outcome, its focal length can be precisely determined. A formula for calculating the focal length is as follows: F = D² / (16 * X²). Where "D" represents the operational diameter of the device - 127 mm. And "X" denotes the measured value in millimeters.
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