explain the working of an astronomical telescope using refraction of light
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An astronomical telescope works on the principle that when an object to be magnified is placed at a large distance from the objective lens of telescope, a virtual, inverted and magnified image of the object is formed at the least distance of distinct vision from the eye held close to the eye piece.
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The astronomical telescope executes the application of two positive lenses: the objective, which produces the image of a distant objective at its focal length, and the eyepiece, which serves as a simplistic magnifier with which to observe the picture produced by the objective. Its length is equivalent to the sum of the focal lengths of the objective and eyepiece, and its angular magnification is -fo /fe, giving a modified image.
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