what do you understand by principle focus of a concave and convex mirror
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A number of rays which falls parallel to the principal axis on a concave mirror meets at a point on the principal axis after getting reflected. This is known as the principal focus of a concave mirror. The incident rays are converged by a convex lens.
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The principal focus of the concave mirror is defined as the point where the light ray meet when get reflected.
And the principal focus of a convex mirror is defined as the point where the virtual rays meet by extending it backward.
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