Refracting Telescope

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Refracting Telescope

Telescopes come in a variety of forms. The form we describe here is the simple refracting telescope that consists of an objective and an eyepiece; both are representedin Fig. 35-18 with simple lenses. although in practice, as is also true for most  microscopes, each lens is actually a compound lens system.The lens arrangements for telescopes and for microscopes are similar, but telescopes are designed to view large objects, such as galaxies, stars, and planets, at
large distances, whereas microscopes are designed for just the opposite purpose. This difference requires that in the telescope of  the second focal point of the objective F2 coincide with the first focal point of the eyepiece F;, whereas in  the microscope of Fig. 35-17 these points are separated by the tube lengths.In 8a, parallel rays from a distant object strike the objective, making an angle Bob with the telescope axis and forming a real, inverted image at the common focal point F2′ F;. This image I acts as an object for the eyepiece, through which

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