r changed to give a beam of wave length 475jujli and anotherexposure made. This is repeated with the monochromator set at550ju^i and 650/1^^. The plate is then moved through a distance d^previously determined, so that the plate now comes behind thefocus. The exposures are repeated through the wave… … FiG. 9.—Diagram illtistrating a tilt of the plate to the lens axis parator or measuring engine with sufficient accuracy for rayssomewhat removed from the axis of the lens. 3. Sources of Error.—^The lens was carefully centered in themethod described above, A slight tilting of the plate would…
Lenses and optical systems
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