An imaginary line passing through the center of the spherical mirror or the center of the lens or the center of curvature is called ______________.
Main axis
For a spherical mirror, the straight line passing through the pole and the centre of curvature is called the principal axis. For a lens, the line through the optical centre and the centres of curvature of its two surfaces is likewise the principal axis.
"Main axis" in the options is the translation of मुख्य अक्ष, i.e., the principal axis. Terms such as "vertical axis", "pole axle" or "spherical pivot" are not standard names in ray optics.
Hence, the imaginary line described is the principal (main) axis.
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