Answer :

The Galilean telescope consists of two lenses- a convex & a concave. The convex lens near to the object is called the objective lens & is of higher focal length. The concave lens near to the eye is called eyepiece and its focal length is less than the objective lens. The parallel rays of light coming from the celestial objects form an image at the focal length of the objective lens. This image acts as an object for eyepiece and after refraction from eyepiece, a final erect & magnified image is formed.


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