Abstract
In the present work, a program for calculating the coefficients of the Aplanatic Cassegrain Telescope (ACT) system, free from the effects of spherical and coma aberrations, were constructed. In addition, the two-mirrors of the optical system, as aspherical surfaces, were adopted. This means, that the two-equations of the mirrors are assumed to be polynomial function of five even terms only. The numerical method, least-squares curve fitting method to calculate the two-mirror coefficients system, was adopted. For choosing the values and ratios that give the best results, Rayleigh Criterion (Rayleigh Limit), for purpose of comparison and preference, was adopted.
Highlights
A telescope is an instrument designed for the observation of remote objects by the collection of electromagnetic radiation.The most important type of reflecting telescope is Cassegrain type [1]
The secondary mirror bounces the light from the primary mirror back down the tube through the hole in the primary, to the focus point behind [3], as shown in Figure (1): Fig. (1): Cassegrain telescope optical layout [3]
A spherical surface whose position is relative to an object point, the rays are refracted through the surface free from all orders of spherical and linear coma aberrations are called an aplanatic surface
Summary
A telescope is an instrument designed for the observation of remote objects by the collection of electromagnetic radiation.The most important type of reflecting telescope is Cassegrain type [1]. A reflecting telescope, or reflector, is one in which the objective is a mirror [2]. The mirror is close to the rear of the telescope and light is bounced off (reflected) as it strikes the mirror. The parabolic primary concave mirror has a hole at its center, and is placed at the bottom of the telescope tube. A smaller hyperbole secondary convex mirror is placed near the top of the telescope. The secondary mirror bounces the light from the primary mirror back down the tube through the hole in the primary, to the focus point behind [3], as shown in Figure (1): Aplanatism: The term aplanatism was used to imply axial stigmatism together with the satisfaction of the exact sine condition2 [5]. A spherical surface whose position is relative to an object point (either real or virtual), the rays are refracted through the surface free from all orders of spherical and linear coma aberrations are called an aplanatic surface
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