What is the principal focus of a concave mirror and a convex mirror?
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The principal focus (denoted by F in the figure) is defined as the point on the principal axis where the light rays traveling parallel to the principal axis after reflection actually meet (for a concave mirror) or appear to meet (for a convex mirror).
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A focus of a concave lens is very similar to a focal point of a concave mirror. ... Then they would converge, on the same side of the lens as the original, parallel rays. This point, where the "virtual" rays converge, is the focal point.
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