Define focal length and radius of curvature for a spherical mirror
Answers
The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light.
In differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations thereof.
Answer:
The length from pole to the focus is called focal length.
The radius of the circle formed with the curved part of the lens is known as radius of curvature.
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