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Calcofluor-White is an fluorescent dye, meaning it has an excitation and emission wavelength that differs from one another. The excitation wavelength is 380 nm while the emission is 475 nm. The fluorescence can best be seen with ultraviolet light, but it can also be seen with violet or blue violet.
The specimen is illuminated with light of a specific wavelength (or wavelengths) which is absorbed by the fluorophores, causing them to emit light of longer wavelengths (i.e., of a different color than the absorbed light). The illumination light is separated from the much weaker emitted fluorescence through the use of a spectral emission filter.
Fluorometer designed to measure chlorophyll fluorescence in plants. A fluorometer, fluorimeter or fluormeter is a device used to measure parameters of visible spectrum fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. [1]
Full-spectrum light is light that covers the electromagnetic spectrum from infrared to near-ultraviolet, or all wavelengths that are useful to plant or animal life; in particular, sunlight is considered full spectrum, even though the solar spectral distribution reaching Earth changes with time of day, latitude, and atmospheric conditions.
Far-red light is a range of light at the extreme red end of the visible spectrum, just before infrared light. Usually regarded as the region between 700 and 750 nm wavelength , it is dimly visible to human eyes.
Another type of finder commonly found on amateur telescopes is known as a reflector (reflex) sight. This non-magnifying sight (technically not a "scope") uses a type of beam splitter to "reflect" a reticle generated by collimating optics into the users field of view.
[30] [33] [39] Due to the prominence of blue light at ocean depths, red light and light of longer wavelengths are muddled, and many predatory reef fish have little to no sensitivity for light at these wavelengths. Fish such as the fairy wrasse that have developed visual sensitivity to longer wavelengths are able to display red fluorescent ...
In 1948 they introduced their fishfinder for use in commercial fishing vessels; the Furuno Fish Finder is the world's first practical fishfinder. [ 5 ] [ 6 ] The first fishfinder marketed to consumers in America for recreational fishing was the Lowrance Fish Lo-K-Tor (also nicknamed "The Little Green Box"), which was invented in 1957 and ...