दर्पण सूत्र (Mirror Formula) क्या है?

उत्तर: (C) 1/v + 1/u = 1/f — Mirror Formula: 1/v + 1/u = 1/f, where v = image distance, u = object distance, f = focal length. Sign convention: distances measured from pole; towards incident light = negative. Magnification m = -v...