What is Joseph von Fraunhofer?
[[File:Fraunhofer 2.jpg|right|thumb|Joseph von Fraunhofer]] '''Joseph Ritter von Fraunhofer''' (6 March 1787 – 7 June 1826) was a [[Germans|German]] [[physicist]]. He was born in 1787 in Bavaria. When he was 11 years old, he had no father and no mother. Because of that, he had to work to survive. He worked making [[glass]] objects for a man called Philipp Anton Weichelsberger. One day, in 1801, the place where Fraunhofer was working fell down and was destroyed. Fraunhofer was inside when this happened. Luckily, some people found him in the middle of the bits of the house and saved him. The Prince of Bavaria was with these people and he decided to help Fraunhofer. The prince decided to give Fraunhofer money and books to study. He studied for five years and one day he was invited to work for a man called Joseph Utzschneider. This man had a company that made glass [[Lens (optics)|lens]]es to be used in scientific instruments. And this company had a secret [[laboratory]] in a [[monastery]] called Benediktbeuern. In this laboratory people were trying to discover how to make better glass lenses. Glass lenses at that time was a very complicated technology. After three years, Fraunhofer was one of the directors of this company. And after eight years he was a partner of the owner. Fraunhofer died very sick in 1826, probably because of the time he worked as a child.{{cn|date=February 2022}} == Spectroscopy == During his time in Benediktbeuern, Fraunhofer did [[experiment]]s with glass. He discovered very important things about [[light]]. One day Fraunhofer was playing with a piece of glass called a [[prism]] and a [[telescope]] in a room full of [[sunlight]]. When he used the telescope to look at the glass, he discovered that he could see all colours of the [[rainbow]]. But there were black lines between the colours. Fraunhofer never discovered what the black lines were; he suggested they might be boundaries between different colors. Many years later, scientists discovered that these black [[spectral line]]s existed