Portrait of Josef von Fraunhofer, 1787-1826

Portrait of Josef von Fraunhofer, 1787-1826

H406/0048 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 52.9MB

Downloadable file size: 4.8MB

Price image Pricing

Please login to use the price calculator

This image is part of the feature 400 Years Of The Telescope



Caption: Portrait of the German physicist and optician Josef von Fraunhofer, 1787-1826. Fraunhofer was apprenticed as a mirror-maker and lens polisher in Munich. In his experiments to produce good quality achromatic lenses he used a prism and slit to provide a monochromatic source of light. In doing so he noticed that the Sun's spectrum was crossed by many dark lines, and he proceeded to measure the wavelengths of almost six hundred of them. He used a diffraction grating to prove that the lines were not merely an effect of the glass of the prism. These Fraunhofer lines were later shown by Kirchhoff to be due to atomic absorption in the Sun's outer atmosphere.

Release details: Model release not available. Property release not required.

Keywords: fraunhofer, fraunhofer lines, josef von, lensmaker, physicist, pioneer, portraits, solar spectrum, sunlight spectrum, surname f

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.