PHYSICS · Multi-part · Fermi University Physics · Optics & Photonics · Geometrical optics and imaging · Geometrical optics and imaging
What an Instrument Can See, Ch Aberrations: the phase written on the pupil
Problem
A photographic lens images a square grid target. At half the maximum field height (relative field height 0.5) and at the maximum field height (relative field height 1.0), the image of a single grid point is examined. At both field positions the point stays a sharp point as the aperture stop is opened and closed (its size does not change), but it is displaced from the position paraxial ray tracing predicts: by 12μm at field height 0.5 and by 96μm at field height 1.0.
((a)) Identify which of the five Seidel aberrations is responsible.
((b)) Show that the two displacements are consistent with that term's known dependence on field height.