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I believe that the field mouse or vole, or whatever the kestrel hunts marks concentric rings around its territory with urine. The mouse/voles urine comes up quite bright on the UV spectrum, so the kestrel often hovers where it can see these bright rings and keeps an eye out for the mouses/voles activity within the ring.
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The disadvantage are that it can cause skin cancer if you are exposed to sufficient amounts of UV light (in particular, UV-B and UV-C light). See the Related Questions link to… the left of this answer for more information about that: "How do UV-B rays affect people?" One of the beneficial uses of UV light are that it can be used to kill bacteria and other microbes. It is commonly used to purify water for instance or clean things. UV light can also be used for a variety of other of application, such as black lights (which just look cool!). Also many compounds fluoresce (they emit light) when exposed to UV light. This is how forensic scientists can find traces of blood and other bodily fluids at crime scenes for instance. Finally exposure to some UV-B light causes the body to make Vitamin D, an important nutrient. While some exposure is important too much will cause sunburns and possibly cancer.
The Kestrel can see into the Ultraviolet Spectrum. A human eye can see between 400nm - 700nm ( Visual Wavelengths. ) It is also correct to describe the human eye as being able… to see between 4,000 - 7,000 Ångströms; The Ångström is simply another unit of measurement, like nm which = nanometers, on the Electromagnetic Spectrum. The smaller the number, as in 4,000 Ångströms, means that the wavelength is shorter, thus the electromagnetic radiation is of higher energy. As opposed to longer wavelengths such 7,000 Ångströms, which is closer to the Infrared. The Kestrel can image wavelenths as short as 3,000 Ångströms, or in correct notation, 3 x 10-7½
If human vision could detect ultraviolet light as well as the visible spectrum, ultraviolet light would appear to be just another color. Of course, because we can't see ultrav…iolet, and can only see three basic colors, the idea of a new color is impossible to completely grasp, since all the colors we see are based off of three primary colors. The addition of ultraviolet light to the spectrum of visible light would allow us to see more things, and some things that appear transparent would appear translucent or opaque, and make things we can already see appear more colorful.
Yes, which is how bees can navigate (using the sun as a reference) even on a cloudy day, because ultraviolet light passes through clouds. Just as we see the sun in a blue sky …background on a clear day, the bee sees the sun in an ultraviolet sky background on even a cloudy day. The underlying reason that the sky appears ultraviolet to a bee (and blue to us) is that something happens to the sun's rays when they hit charged particles. These charged particles are in the ionosphere and in Nitrogen and Oxygen "dipoles" in the atmosphere. The sun's radiation will cause the charged particle to vibrate, and when the charged particle vibrates it re-radiates energy. If you work out the mathematics (physics) of this re-radiation, it turns out that the energy is re-radiated in proportion to the fourth power of the frequency (as discovered by Raleigh in the 1800's and worked out with a more accurate distribution formula by Einstein early in the 20th century). For humans, who have eyes that have blue, yellow and red sensors, the fourth power formula means that blue from the sky is ten times stronger than red, so the sky looks blue. Similarly, for bees (and other insects), the highest frequency sensors in their eyes detect ultraviolet), and so the sky appears ultraviolet to them. Sources: Karl von Frisch on Bees (e.g. in Answers.com); basic courses on electrodynamics and magnetism (or Google "Why is the sky blue").
the answer is yes. Butterflies have average eyesight. They do have one advantage over most other insects in that they can see colour. Their colour vision, however, is shifte…d towards the ultraviolet end of the spectrum. ^this means that butterflies can see ultraviolet light
Humans do not see ultraviolet light, but there are some who can who have had to have replacements in their eyes, which altered their vision so that they can.
No. They can not see in ultraviolet light. They are known to glow when exposed to ultraviolet light, though.
Ultraviolet light is invisible to the human eye. UV light is found in sunlight and is emitted by electric arcs and specialized lights such as black lights. It can cause chemic…al reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
No, the human cannot see ultraviolet rays with the naked eye.
no, because ultraviolet rays are just above seeing and with ultraviolet lights, you see a more violet color.
they can see in color.
fingerprints are made of organic compounds that absorb UV light and then emit visible light.