Question

$explain \: the \: working \: of \: \\ an \: astronomical \: \\ telescope \: using \: refraction \\ \: of \: light$
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Answer 1

Answer:

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.

Answer 2

Explanation:

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The astronomical telescope consists of two lenses: objective and eyepiece. Objective has larger focal length and diameter to accommodate maximum amount of light coming from the far away (astronomical) objects. A parallel beam of rays from an astronomical object is made to fall on the objective lens of the telescope. It forms a real, inverted and diminished image A′B′ of the object. The eyepiece is so adjusted that A′B′ lies just at the focus of the eye piece. Therefore, a highly magnified image of the object is formed at infinity.