A telescope made with lenses is called a refracting telescope - Deepstash
A telescope made with lenses is called a refracting telescope

A telescope made with lenses is called a refracting telescope

A lens bends light passing through it, like eyeglasses, to make faraway objects seem closer.

Thick lenses are more powerful but also very heavy. Heavy lenses are difficult to make and hold in the right place. Thicker glass also prevents more of the light from passing through. Because light is passing through the lens, the lens's surface has to be extremely smooth. 

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