The Effect of Air Gap Width (S) and the Ratio (P1/D2) on .Minimum Projector Focal Length (Fp)min for the Double Pole-Piece Lens- at Costant Excitation (NI). Ibn AL-Haitham Journal For Pure and Applied Sciences, [S. l.], v. 21, n. 3, p. 95–111, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/1412.. Acesso em: 16 jul. 2024.