Why human eyes are sensitive to blue than violet?
814912
If you check the link, look at the chart of the color sensitivity of the eye cone photoreceptors.  Notice how the blue cone sensitivity drops as you move to higher frequency-shorter wavelength, towards the violet.\nThat is why.
76619
The answer lies in the structure of the eye.  There are two types of receptors in the eye, rods and cones.  Cones are the color receptors but are less sensitive to light.  Rods are very sensitive to light but do not distinguish color.\n\nMany animals, especially nocturnal animals, pack a greater number of rod receptors into their eyes allowing them greater sensitivity to light allowing them to see in conditions that are too dark for huuman eyes with their lesser number of rods.\n\nIt is a tradeoff between color and light sensitivity with humans weighing in more heavily in the color category.
1163020
Not as sure about purple vs blue (although I too have wondered about this).\n\nHere is an experiment you should be able to easily reproduce the results of.  Pick a set of colors that we might agree on as "aqua" or "teal" or "blue-green".  Then, FORCE a group of people to say whether each color is either blue or green.  It would seem that we are all tuned a bit differently.
297785
Because our "air" is composed mostly of nitrogen.  The nitrogen filters out the "blue" wave length of white light.
784665
Sorry, wagonpaws is not correct. A 6000K blackbody (like the Sun) has a peak output at .483 microns (483 nm), which is blue. But .55 microns (550 nm) is the wavelength that human eyes are most sensitive to.
187887
I feel its the opposite. Because every object absorbs all colours in the white light and reflects only a particular colour which is seen by your eyes. Now there are many times where the eye can be fooled like the forward mails you would have seen (optical illusion ones).\n\nIf something is Blue its actually the opposite of blue, that is, all other colours mixed but blue ;) \n\nIf something looks black, its merely not capable of reflection, so you dont know what its colour is...\n\nhehehehehehe wierd theory right?
768561
Air scatters different wavelengths of light different amounts.  We normally see the sky as blue because the sky scatters higher wavelengths of light more then lower wavelengths of light.  Blue is a short wavelength while red is a long wavelength.  Anyway, when the sun is rising or setting on the horizon you are looking through much more air to see the sun then say, at noon when the sun is straight over head.  There is so much air that you see the red, instead of the blue, because the blue has long since scattered off while the red is still able to travel through the atmosphere to your eyes.
124021
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light.  When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.
197523
Everyone sees everything a little differently than others.  As for colours, it's how your eyes may process light and how your brain may interpret that light.  \n\nIf you're seeing blue while I see red or vise-versa, there's a big problem because those two colors are opposites (actually red and cyan, which is kinda blue).
950538
You're right - for some reason most people favor blue over the other colors. The second favorite color people have is green I've noticed, btw. And when it comes to blue, it's baby blue that the majority like the most. Although I'm not certain as to why that is, I think it may be because so many good things are associated with the color blue - sky, ocean, eyes...and blue jeans =)
1121858
Light infusion from the sky gives the blue appearance that most observe
928427
The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. \n\nHowever, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue. \n\nAs you look closer to the horizon, the sky appears much paler in color. To reach you, the scattered blue light must pass through more air. Some of it gets scattered away again in other directions. Less blue light reaches your eyes. The color of the sky near the horizon appears paler or white. \n\nSOURCES:\nhttp://www.sciencemadesimple.com/sky_blu...\n\nThe Earth's sky is blue because the air molecules (largely nitrogen and oxygen) are much smaller than the wavelength of light. When light encounters particles much smaller than its wavelength, the scattered intensity is inversely proportional to the 4'th power of the wavelength. This is called "Rayleigh scattering," and it means that half the wavelength is scattered with 2**4 = 16 times more intensity.\nThat's why the sky appears blue: the blue light is scattered some 16 times more strongly than the red light. Rayleigh scattering is also the reason why the setting Sun appears red: the blue light has been scattered away from the direct sunlight.\n\nThus, if the atmosphere of another planet is composed of a transparent gas or gases whose molecules are much smaller than the wavelength of light, we would, in general, also expect the sky on that planet to have a blue color.\n\nIf you want another color of the sky, you need bigger particles in the air. You need something bigger than molecules in the air--dust.\n\nDust particles can be many times larger than air molecules but still small enough to not fall out to the ground. If the dust particles are much larger than the wavelength of light, the scattered light will be neutral in color (i.e., white or gray)---this also happens in clouds here on Earth, which consist of water droplets. If the dust particles are of approximately the same size as the wavelength of light, the situation gets complex, and all sorts of interesting scattering phenomena may happen. This happens here on Earth from time to time, particularly in desert areas, where the sky may appear white, brown, or some other color. Dust is also responsible for the pinkish sky on Mars, as seen in the photographs returned from the Viking landers.\n\nIf the atmosphere contains lots of dust, the direct light from the Sun or Moon may occasionally get some quite unusual color. Sometimes, green and blue moons have been reported. These phenomena are quite rare though---they happen only "once in a blue moon...." :) The dust responsible for these unusual color phenomena is most often volcanic in origin. When El Chicon erupted in 1982, this caused unusually strongly colored sunsets in equatorial areas for more than one year. The much bigger volcanic explosion at Krakatoa, some 110 years ago,\ncaused green and blue moons worldwide for a few years.\n\nOne possible exception to the above discussion is if the clouds on the planet are composed of a strongly colored chemical. This might occur on Jupiter, where the clouds are thought to contain sulfur, phosphorus, and/or various organic chemicals.\n\nIt's also worth pointing out that the light of the planet's primary is\nquite insignificant. Our eyes are highly adaptable to the dominating illumination and perceive it as "white," within a quite wide range of possible colors. During daytime, we perceive the light from the Sun (6000 K) as white, and at night we perceive the light from our incandescent lamps (2800 K, like a late, cool M star) as white
1044291
Although your brain generally filters it out, the human eye has a fair amount of chromatic aberration. Blue and violet light in particular tend not to come to a sharp focus, so filtering it out adds to visual acuity. At greater distances, it also helps cut haze, as short wavelengths (blue end of the spectrum) are scattered more than long wavelengths.
353743
My big blue eyes (their almost like a dark sapphire color)...sometimes, depending on my mood, the white part will have a bluish tint to it as well.
731741
I haven't seen that personally.  Actually, according to scientific studies, people with lighter eyes (especially bright blue) tend to have more eye problems than any other eyecolor.  There could be some vitamin or mineral deficiency that Asians have that I am unaware of though.
145839
Blue is a short wavelength, shorter than green or red, and our eyes are sensitive to it. The reason the short wavelengths are scattered out of sunlight is because of the size of the nitrogen and oxygen molecules in the air; they are much smaller than the wavelength of light, so they scatter the shortest wavelengths, which are towards the blue end of the spectrum. \n\nOf course, the sky is sometimes green, during a green flash or red, at sunrise or sunset when the red of the sun is reflected from dust and air droplets in the air. \n\nAt sunset, the sunlight has to travel through more air, so more blue gets scattered out, leaving orange, and eventually red light, as more blue gets removed. \n\n(sorta white sunlight)-(blue light gets scattered out)=(yellow sunlight)\n\nAnd as the sun sets:\n\n(sorta white sunlight)-(even more blue light removed)=(orange or red sunlight)
330696
Insects are attracted to the light reflected of the plants and they are most certainly NOT color-blind. Bees can see into the ultra-violet end of the spectrum farther than humans so they don't see the same colors we do.