Galilean telescopes

Galilean telescopes are a type of optical telescope that uses a simple design to magnify distant objects. They consist of two primary lenses: a convex lens (which gathers light and brings it to focus) as the objective and a concave lens (which helps to enlarge the image) as the eyepiece. This arrangement creates a upright image. Named after Galileo Galilei, who popularized them in the early 17th century, these telescopes are known for their relatively short length and ease of construction, making them suitable for observing celestial bodies like the moon and planets.