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History
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Joseph von Fraunhofer
Joseph von Fraunhofer
Fraunhofer demonstrating the spectroscope
Fraunhofer demonstrating the spectroscope
Illustration of solar spectrum drawn and colored by Joseph von Fraunhofer with dark lines named after him (1987 DBP's stamp on 200th anniversary of bi
Illustration of solar spectrum drawn and colored by Joseph von Fraunhofer with dark lines named after him (1987 DBP's stamp on 200th anniversary of birthday of Fraunhofer)
The 9"-aperture refractor telescope with which Neptune was discovered
The 9"-aperture refractor telescope with which Neptune was discovered
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A very large reflecting diffraction grating
A very large reflecting diffraction grating
An incandescent light bulb viewed through a diffractive effects filter.
An incandescent light bulb viewed through a diffractive effects filter.
A blazed diffraction grating reflecting only the green portion of the spectrum from a room's fluorescent lighting
A blazed diffraction grating reflecting only the green portion of the spectrum from a room's fluorescent lighting
A helical fluorescent lamp photographed in a blazed reflection-diffraction grating, showing the various spectral lines produced by the lamp.
A helical fluorescent lamp photographed in a blazed reflection-diffraction grating, showing the various spectral lines produced by the lamp.