By Chris Velzel
A path in Lens layout is an guide within the layout of image-forming optical structures. It teaches how a passable layout could be acquired in a simple method. conception is restricted to a minimal, and used to aid the sensible layout paintings. The publication introduces geometrical optics, optical tools and aberrations. It offers an outline of the method of lens layout and of the suggestions utilized in this procedure. half its content material is dedicated to the layout of 16 forms of lenses, defined intimately from starting to finish. This ebook isn't like such a lot different books on lens layout since it stresses the significance of the preliminary levels of the layout procedure: (paraxial) lay-out and (thin-lens) pre-design. The argument for this alteration of accessory is that during those stages a lot details may be bought in regards to the homes of the lens to be designed. this knowledge can be utilized in later stages of the layout. This makes A path in Lens layout an invaluable self-study publication and an appropriate foundation for an introductory direction in lens layout. the maths regularly used is university algebra, in a couple of sections calculus is utilized. The ebook should be utilized by scholars of engineering and technical physics and via engineers and scientists.
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Extra resources for A Course in Lens Design
In this arrangement, with a single lens ocular, we take the aperture stop at the objective. Then the exit pupil is at a distance behind the ocular given by 1 À1 1 ¼ þ s02 f 1 þ f 2 f 2 Because f 1 þ f 2 ) f 2 , we have s02 ﬃ f 2 ; s02 is called the eye relief. The linear magnification, defined as the ratio between the ray heights in the exit and entrance pupils, is ML ¼ À ff 2 . 1 0 The angular magnification, defined as the ratio w w (see Fig. 8) is given by MA ¼ À ff 1 : 2 (ML ¼ M1 is an example of a more general relationship, known as Lagrange’s A invariant, see Sect.
702. The position of the image-side principal point is given by: V4 H0 ¼ ðh1 À h4 Þ=u4 0 ¼ À1:659 The values of the front focal length, the focal length f and the position of the object-side principal point are found by tracing a ray backwards through the system, with starting values u40 = 0, h4 = 1. 284. As a check on this calculation we should find f = -f0 . 03 mm between the two values found; certainly due to rounding. 18 1 Geometrical Optics This procedure can be applied with all centered systems.
This is shown in Fig. 9. An improvement of this situation can be obtained by the use of a field lens, see Fig. 10. When we put a lens in (or near) the point F where intermediate image is, and take the power of this lens so that the objective is imaged by it on the eye lens, we can take the diameter of the field lens Fig. 16, so that the field angle U0F is what f1 we want. 02. Because, as we will see later, a lens near the image plane does not contribute much to the aberrations, we can make its diameter easily larger to obtain a larger field angle.