What is a spherometer ?

What is a spherometer ?
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1 Answer

Answer :

It is a micrometer screw that can be used to measure the curvature of the spherical surface , the thickness of the thin sheet, etc. This instrument is called a spherometer because it measures the radius of curvature of a spherical surface .
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How can there be mechanical error in spherometer ?

Description : How can there be mechanical error in spherometer ?

Last Answer : : When the three legs of the spherometer and the screw-head touch a plane, the instrument has an error if the zero point of the circular scale does not match the zero point of the linear scale. This error is a mechanical error.