The sky appears blue rather than violet due to the human eye's sensitivity to different wavelengths of light and the absorption of violet light by the ozone layer. Human color vision relies on three types of receptors that are less sensitive to violet wavelengths, resulting in a diminished perception of violet compared to blue. Additionally, the spectrum of sunlight contains lower levels of violet light, further contributing to this phenomenon. This discussion highlights the interplay between light intensity, wavelength sensitivity, and color perception.
PREREQUISITESStudents of optics, educators in physics or biology, and anyone interested in the science of color perception and atmospheric phenomena.
Our colour vision relies precisely on this. We have three sets of receptors that have varying sensitivities over the range of visible radiation and our brain takes in the combination of outputs from the three sensors and 'categorises' them into colours (Search Tristimulus Colour Vision theory"). The sensitivity of the sensors to wavelengths corresponding to Violet is very low (it's right on the 'skirts' of sensitivity). Also, the spectrum of Sunlight is relatively low in Violet content so we just don't care too much about Violet (in a manner of speaking) and doesn't discriminate too much. If you change the amount of the 'violet wavelengths' in the light entering the eye, it will make very little difference to the perceived colour; the colour that the brain assigns to what is seen.sunmoon said:And why different light waves having different intensity produce different sensation in our eyes?