Why does a spherometer have three legs?
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Explanation:
A spherometer in an instrument for the precise measurement of the radius of curvature of the sphere or a curved surface. Originally these instruments were used by opticians to measure the curvature of the surface of lenses.
In general, the spherometer consists of
1. A base circle of three legs, the radius of the base circle is already known.
2. A central leg which van be raised or lowered.
3. A reading device for measuring the distance when the central leg is moved.
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because that form a equilateral triangle
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