How to prove f=r/2 in hindi | relation between focus and radius of curvature.

Sr Classes, how to prove f=r/2 in hindi | relation between focus and radius of curvature with easy method. #relationbwfandr #srclasses #srclassesphysics #srclasseschemistry #srclassesmath #srclasseschemistry #howtoproofrelationbwfandR #relationbwfocuslenghthandradiusofcurvature

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