Joseph von Fraunhofer (1787-1826),German optician. He is known for the discovery of the dark absorption lines known as Fraunhofer lines in the Sun's spectrum,and for making excellent optical glass and achromatic telescope objectives | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Science Source |
Taille de l’image : | 2550 px × 3829 px |
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Property Release : | Non requis |
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