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Galileo Galilee is known as the “father of telescopes” and rightly so. He is the inventor of the telescope and every telescope made after his invention follows the same principle that he used. Galileo’s telescope was a primitive prototype of the telescopes that are used widely today. However, the principles he used are the very same ones still being used to this day. Galileo’s telescope used two lenses - one concave and one convex - inside a tube-light shaped device. Convex lenses are those lenses whose edges curve inwards and concave lenses are lenses that have outward curves at the edge. The eyepiece in the telescope was constructed with the concave lens. Spy glasses, invented around the same time and used by militants to observe enemy activity in camps, were a major inspiration to Galileo in making his own telescope.