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A diagram of the Newtonian reflecting telescope (or reflector) is shown in Fig. 15-25. Parallel light rays from a distant source are incident on the mirror at the base of the instrument. Because the mirror surface is curved, the rays are converged toward a focus. A Newtonian reflecting telescope. In order that the rays be brought to a proper focus in a reflecting telescope, the main mirror must be in the shape of a paraboloid, a surface generated by rotating a parabola around its axis. A spherical surface is adequate if the mirror is relatively small and is not intended for the most precise work. The aperture is the diameter of the opening on the front of a telescope. The bigger the aperture, the more light can enter the telescope. Your eye has an aperture, too: your pupil. This aperture is only ever a few millimetres large. But optical telescopes rarely have apertures smaller than 8 centimetres. Download PDF. NCERT Solutions. Class 12 NCERT Reflecting telescopes are extraordinarily popular for astronomy and many famous telescopes such as the 'hubble other wavelengths of light, and for example, x-ray telescopes also use the reflection principle to make image forming optics. Let's discuss some reflecting type telescopes and This is the first book dedicated exclusively to all-reflective imaging systems. It is a teaching tool as well as a practical design tool for anyone who specializes in optics, particularly for those interested in telescopes, infrared, and grazing-incidence systems. The first part of the book describes a unified geometric optical theory of all Do not let children use telescope at daylight without an adult control. The telescope TAL-65 (hereinafter referred to as the telescope) is designed for visual observations of celestial objects. The telescope can be used for individual observations by ama-teur astronomers, in the schools, in the astronomic societies. Refracting telescopes use converging lenses Lenses make images of objects that can be worked out using Ray diagrams Or the lens formula (1/f = 1/u + 1/v) The telescope consists of two lenses set at a distance = fo + fe (normal adjustment) fDisadvantages of Refractors They suffer from chromatic aberration. Bubbles and impurities in the glass A refracting telescope is an optical telescope that uses lens as its objective to form image. It fact that its image is formed by bending of light or refraction. A refractor can be a combination of a convex lens and a concave lens or a combination of two convex lenses. It is also known as dioptrics (smith & 1988). In this paper, we design the optics of a reflecting telescope for a CubeSat unlike previous missions. A major objective is to acquire high-quality images of the Earth's surface with our new, small plane and spherical reflecting and refracting surfaces. We then go on to describe the construction and working of some important optical instruments, including the human eye. PARTICLE MODEL OF LIGHT Newton's fundamental contributions to mathematics, mechanics, and gravitation often blind us to his deep experimental and theoretical study of light. telescope is a Keplerian or Astronomical tel