By Daniel Malacara (Eds.)

ISBN-10: 0080860133

ISBN-13: 9780080860138

ISBN-10: 012475970X

ISBN-13: 9780124759701

Malacara e.D. (ed.) Geometrical and instrumental optics (AP, 1988)(ISBN 012475970X)

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55) are not strictly true. The chromatic blurs are not additive when the chromatic blurs become large. This error does not cause difficulty in most practical cases, but it has STOPS, PUPILS, VIGNETTING, AND TELECENTRICITY 37 FIG. 29. An example of how the secondary color can be reduced by placing a lens in a position where there is a substantial spreading of the color rays. masked thinking of possible ways to correct secondary color, because Eq. 59) suggests that secondary color cannot be corrected with ordinary glasses using a large V difference.

94) ws = 0. 101) CT; + + = Q3al 3 Q2u2Q(3 w3 + u,) + ug . 102) 48 GEOMETRICAL OPTICS from the Ian* FIG. 38. A diagram showing a stop shift and the data used to compute Q. The quantities with * are the new coefficients obtained by having the stop removed from the lens. Q is Y*/y, where p* is the height of the new chief ray on the lens, and y is the height of the axial ray. This is illustrated in Fig. 38. The following example shows how one can devise concepts to shape lenses and correct aberrations.

Figure 17 shows the calculation of a double reflection in a single lens. This calculation locates the position of a ghost image. The problem is set up as follows. 1. Draw a picture of the lens and sketch the path of the ray to be traced. One should always do this before tracing a ray. 1s 1 Y. 1167 -0. 4565 22 GEOMETRICAL OPTICS the lens, for this gives a feeling for how lenses work. It also helps to reveal stupid input mistakes, which computers enjoy grinding on just as much as on the correct problem.

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Geometrical and Instrumental Optics by Daniel Malacara (Eds.)

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