P Q K -E- £ax but /- (J sm u^and KP=F,.,KP^==fn where the subscript ax refers to the axial zone. 350 Bulletin of the Bureau of Sta^uiards [Vol. 14 Hence, For the axial zone, uu K, P,. Hence Eq — /n = O is the condition for a symmetrical image freefrom comatic flare in a lens with spherical… … FiG. 6.—Diagram illustrating image by lens with conditionl ~r-——f=o ) fulfilled senting the zonal variation of the E. F. h. If we represent theE. F. L. of the zone h by E^, and that of the axial zone by £ai, then AE=Eh-E^j, Similarly, if /ai is the distance from the paraxial principal pointto the…
Lenses and optical systems
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