Hans Liebersch.
In 1608, Hans Liebersch, a Dutch optician, accidentally discovered that he could see distant objects clearly with two lenses. Inspired by this, he built the first telescope in human history. .
A telescope is an optical instrument that uses lenses or mirrors and other optical devices to observe distant objects. It uses the refraction of light through a lens or the reflection of light by a concave mirror to enter a small hole and converge into an image, and then is seen through a magnifying eyepiece, also known as a "telescope".