spherometer
/sfɪˈrɑmɪtər/
noun
- A device used to measure the curvature or radius of a curved surface, such as a lens or mirror.
- In the physics lab, students learned how to read a spherometer to measure the curvature of a mirror.
- The technician adjusted the spherometer carefully to get an accurate reading of the sphere's radius.
- The optician used a spherometer to check the curve of the eyeglass lens.