If p. q, r denote the object distance, image distance and the radius of curvature respectively of a spherical mirror, then prove that r= 2pq/(p+q).

If p. q, r denote the object distance, image distance and the radius o

1.	If p. q, r denote the object distance, image distance and the radius of curvature respectively of a spherical mirror, then prove that r= 2pq/(p+q).
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