Question

Which of the following instruments can be used to determine the radius of curvature of a spherical surface?

Answer 1

Hint: A spherometer is a device used to calculate the radius of curvature of a spherical surface. To measure the curvature of a lens' surface, optometrists first used spirometers. The radius of the sphere to which the curved surface of the lens belongs is more essential than the radius of the lens or mirror. This radius is referred to as the radius of curvature, and it is measured with a spherometer.

Complete answer:
A spherical lens or mirror surface's centre of curvature is either along or decentered from the system's local optical axis. The vertex of the lens surface is positioned on the local optical axis. The radius of curvature of a surface is the distance between its vertex and its centre of curvature.
A spherometer is a device used to calculate the radius of curvature. A spherometer is a critical scientific tool for accurately measuring the radius of curvature of any spherical surface. The least count is the smallest value measured by the spherometer.
A spherometer works on the micrometre screw principle. It gets its name from the fact that it is used to measure the very thin thickness of flat materials like glass or the radius of curvature of a spherical surface.

Note:
The zero reading must be validated for accuracy before using the spherometer. A level surface results in a zero height difference, and the spherometer comes with a piece of flat plate glass for testing. Instead of being at either end of the scale, the vertical scale zero is situated in the middle. As a result, the spherometer can measure both positive and negative height differences, corresponding to convex and concave surfaces.