Download e-book for kindle: A Course in Lens Design by Chris Velzel

By Chris Velzel

ISBN-10: 9401786844

ISBN-13: 9789401786843

ISBN-10: 9401786852

ISBN-13: 9789401786850

A direction in Lens layout is an guide within the layout of image-forming optical structures. It teaches how a passable layout might be acquired in an easy method. concept is proscribed to a minimal, and used to help the sensible layout paintings. The booklet introduces geometrical optics, optical tools and aberrations. It provides an outline of the method of lens layout and of the innovations utilized in this procedure. 1/2 its content material is dedicated to the layout of 16 forms of lenses, defined intimately from commencing to finish. This publication isn't the same as so much different books on lens layout since it stresses the significance of the preliminary stages of the layout method: (paraxial) lay-out and (thin-lens) pre-design. The argument for this alteration of accessory is that during those stages a lot info should be bought in regards to the houses of the lens to be designed. this knowledge can be utilized in later stages of the layout. This makes A direction in Lens layout an invaluable self-study ebook and an appropriate foundation for an introductory direction in lens layout. the math in general used is university algebra, in a couple of sections calculus is utilized. The publication might be utilized by scholars of engineering and technical physics and through engineers and scientists.

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With telescope and microscope oculars UF = 20 mm is frequently used. 75 mm, and the field lens acts as a field stop. Over the whole field we have (nearly) no vignetting. 34 2 Optical Instruments (Paraxial Approximation) Fig. 9 Vignetting in a simple telescope Fig. 10 Telescope with field lens In this set-up the eye of the observer should be immediately behind the eye lens; in many situations this is not practical, an eye relief of a few centimeters is usually required. This leads to a compromise, by taking a slightly larger Uoc and increasing the focal length of the field lens, we obtain the final lay-out.

23. In this system the first lens is the field stop. The chief ray in object space points to the centre of the entrance pupil (marked by an E). In image space it seems to come from the centre of the exit pupil (marked by an X). Rays from the object point Q above the chief ray do not pass the system. Only part of the beam from Q reaches the image plane; this effect is called vignetting. We take Q as the edge of the usable field. Vignetting can be prevented when the field stop is in the object plane or a plane conjugated with it.

6). The angular magnification of the compound microscope is given by M ¼ Mob 250 ; f oc ð2Þ where Mob is the (linear) magnification of the objective and foc the focal length of the ocular. 5 lm. This is of the order of the wavelength of light, so we should consider the effect of diffraction. According to the theory of diffraction the smallest detail that can be resolved by an objective with aperture angle u is given by [see Sect. 53)] Dy ¼ 0:6 k ; n sin u where n is the index in object space, k is the wavelength in vacuo; n sin u is called the numerical aperture.

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A Course in Lens Design by Chris Velzel

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