Telescopes

What we learn in this chapter

Telescopes and antennas collect photons, and the detectors at their foci record the information content of the radiation, its intensity and polarization as a function of time, and also its frequency distribution and direction of arrival. There are several common configurations of optical telescopes. Focal length and aperture determine the plate scale, sensitivity and potential resolution of the telescope. Non-focusing instruments are used by gamma-ray astronomers while x-ray astronomers use both focusing and non-focusing systems. Telescope resolution may be limited by diffraction. The point-spread function describes the shape of the (single pixel) telescope beam. The resolution of large ground-based optical telescopes is severely limited by non-planar wavefronts caused by atmospheric turbulence. Speckle interferometry and adaptive optics are techniques for overcoming this limitation.

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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