What is the main function of the anvil in the construction of a micrometer?
Provides a stationary measuring surface
A micrometer measures a dimension by trapping the workpiece between two measuring faces and reading how far apart they sit; one face must move and one must stay put.
The governing principle is that every precise measurement needs a fixed datum — an unmoving reference from which the movement of the other face is measured.
The anvil is that fixed datum. The workpiece rests against it while the spindle is advanced to close gently onto the opposite side, so the anvil supplies the stationary measuring surface.
Displaying the main-scale reading is the job of the graduated sleeve (barrel), not the anvil, so that option describes a different part.
Rotating the spindle is done by turning the thimble; the anvil never moves and cannot drive the spindle.
Setting a light, repeatable measuring pressure is the ratchet stop's function, again separate from the anvil.
Because only the anvil serves as the fixed face against which measurement is referenced, that is its main function.
Hence, the answer is Provides a stationary measuring surface.
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