Give reason why in spherometer main scale is marked on both sides of zero
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A spherometer basically is a precision instrument to measure very small lengths. Its name reflects the way it is used to measure the radii of curvature of spherical surfaces. It is based on the principle of screw. ... On the new spherometer, the vertical scale is marked off in units of 0.5 mm.
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Since the spherometer is essentially a type of micrometer, it can be employed for purposes other than measuring the curvature of a spherical surface. For example, it can be used to measure the thickness of a thin plate.
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