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[[image - mathematical diagram of light refracted through a curved lens; with points labeled A, a, B, b, C, D, E, F, G, H, I, K, L, M (point M also labeled as Focus) and broken lines labeled a, b]] [[Put?]] GA = Q CB = R CD = [[V?]] FM = F FB = [[Y?]] LN = Y Maskelyne's Theorem at p. 77 of my M.S. See philosophical Tranactions 1763 No. 31: p. 173.