Is there an invisible light

Visible and Invisible Light pp 100-111 | Cite as

Part of the Understandable Science book series (VW, volume 35)


It is a peculiarity of the physical method of research that it takes the terms more generally than is customary in everyday life. This becomes particularly clear with the example of light. We have broken down the light of the sun into a colored spectrum. We noticed that our eye receives the light impression "red" and "violet" through the extreme limits of the spectral band. The measurement of the wavelength sets the limits numerically to about 7700 Å at the red and about 4000 Å at the violet end. Nothing, however, compels us to assume that the whole extent of the solar spectrum is actually exhausted as long as we only use our eyes as a receiver of radiation. In fact, the eye is only sensitive to a very limited range of wavelengths. In addition, it is incapable of conveying precise information about the intensity of light radiation. We now want to get to know the light that is invisible to our eyes a little better.

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Special hint

This chapter is part of the Springer Book Archives digitization project with publications that have appeared since the publisher's beginnings in 1842. With this archive, the publisher provides sources for both historical and disciplinary research, which must be viewed in a historical context. This chapter is from a book that was published before 1945 and is therefore not advertised by the publisher in its political-ideological orientation typical of the time.

Copyright information

© Julius Springer in Berlin 1938

Authors and Affiliations

  1. 1.University of Munich, Germany