Laurence, Lionel · London, School of Optics · leaf 249
utralised by positive distortion of the back lens. Separation of the component parts of a lens system can te utilised for ABERRATIONS OP FORM 237 the correction of distortion, and in single lenses it may be reduced somewhatby altering the thickness and curves of the lens. The Tangent Condition.—A… … Fig. 252. When all the chief points thus formed lie in a plane perpendicular to theaxis, i.e. the refracting plane, the refracted chief rays, produced back to theaxis, meet in a single point C The lens is then said to be spherically correctedwith regard to the stop. Each chief ray makes with the…
Optics
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