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Main Question or Discussion Point
What is radius of curvature and why is it equal to 2f where f is the focal length of a lens or a mirror ?
For a concave mirror seeWhat is radius of curvature and why is it equal to 2f where f is the focal length of a lens or a mirror ?
In my picture, the arc center is O because it is a part of a cicle. Remember that diagram and thurs formula only fits for a spherical concave mirror.but looking at th diagram I don't see where the centre of that arc is.