sin 20

If we take y = ym, we have the coordinates of rays distributed round the edge of the pupil at azimuth angle 0. This leads to the classical transverse aberration of Fig. 3.18, known as the "coma patch". The principal ray intersects at the point I . This corresponds to the point E' at the centre of the pupil (right-hand diagram). Because of the double angle 20, both the marginal rays 1 in the t-section cut at the same point 1 in the coma patch. The ray coordinates lie on circles of radius



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