Download Reflecting Telescope Optics I: Basic Design Theory and its by R. N. Wilson PDF
By R. N. Wilson
This is often the 1st quantity of a enormous paintings that's meant to offer an entire therapy of reflecting telescope optics. It addresses the experts within the box, either within the astronomical group and in undefined. therefore, topics reminiscent of sensible alignment, try thoughts, and upkeep elements occupy an important half. while the second one quantity will be aware of technical features and sleek advancements, this ebook is dedicated to the idea of reflecting telescope optics and with its historic improvement it may even be worthwhile to scholars.
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Extra resources for Reflecting Telescope Optics I: Basic Design Theory and its Historical Development (2nd Edition)
Example text
The focal length f will determine Fig. 9. Image principal plane in the defocused telescope of Fig. 6) of the real image I2 . The smaller the defocus, the smaller will be ur2 and the larger the value of f , which can be made far larger than f1 = P1 I1 , the focal length of the objective. In other words, the defocused telescope becomes a strong telephoto objective, a property identical with that of reflecting telescopes of the Gregory and Cassegrain forms. We shall see that the case of Fig. 9 corresponds exactly to the Gregory telescope.
Although the operation may at first sight seem trivial, it is very instructive to trace the paraxial ray through the system using Eqs. 3 in Chap. 3 where the paraxial parameters are used for calculating the third order aberrations. The ray trace for the first surface (prime focus) is common to both Gregory and Cassegrain. 2 shows the signs of the paraxial quantities, the most important aspect being the sign reversals in certain cases between the Gregory and Cassegrain forms. 2 The ideal optical system, geometrical optics and Gaussian optics 43 Fig.
55) in which the normal transverse magnification ratio η2 /η1 is multiplied by n2 /n1 . 2 for the Cassegrain case n2 is positive and n1 is negative while, as mentioned above, η2 and η1 are both negative. It follows also that f1 is negative, with f positive. The definition of Eq. 55) therefore gives the same value for m2 as the transverse magnification, but with reversed, that is negative sign in the Cassegrain case. 11] also defined m2 as f /f1 , but he used a non-Cartesian sign convention of special form, not suitable for general application, giving f1 as positive.