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The most well-known feature in showing the usefulness of magnetic lenses is the bipolar zone. The best in terms of projector focus and optical qualities. The most important aspect of the magnetic electron lens is the position of the electrode. Smoothly, the magnetic area rises up and equally with the biggest expected value, and it has got just a single vertex. This study aims to identify and access the relationship between the radii of the pole aperture and the iron arm aperture in the figure of the electronic magnetic lens of the snorkel kind, which starts (according to the design in this research) at (R = 2 mm) taking into account the rotational axis of the magnetic lens. The optical properties of the electron lenses are improved. We also notice from the results that the relationship between (R1 & R2) becomes linear for the period (R1>17mm), so the performance of the magnetic lens and its optical properties are in the best option at (R1 = 2 mm, R2 = 2 mm). which are values that are not suitable for practical applications, and describe the improvement in optical properties in the equation extracted from the calculations, where it was found that there is a close and direct relationship between the pole dimension (represented by the radius of the pole hole) and the iron arm dimension (represented by the radius of the iron arm), for the axis of the magnetic lens, where the designer can, and according to the engineering requirements, conclude geometrical parameters using the relationships between them. FEMM and MELOP have been used to check the ability of the lens axial magnetic field and focal optical properties. [ABSTRACT FROM AUTHOR]