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aperture stop auxiliary axis axial point bending calculation centre chromatic aberration coefficients coma components conjugate cos2 curve diagram diameter dioptres distant object distortion entrance pupil example exit pupil eyepiece field lens flux focal length focal lines focal point foci focus geometrical optics given glass ideal image plane illumination image distance image point image space lens or system lenses light longitudinal chromatism lumens luminance luminous flux magnification marginal ray meridian normal object distance object point obtain optical axis optical instruments optical system order theory paraxial region Petzval surface point Q point sphere position primary aberrations principal points principal ray prism radius refracting surface refractive index rotation second surface slope angle solid angle spectacle lenses spherical aberration spherical surface thickness thin lens third order equations third order theory tism toric transverse chromatism trigonometrical computation values wavefront wavelength zero zonal zone