![]() Many winged insects will fly in to eat the flower’s nectar and help promote biodiversity. Like many indigenous plants, it makes an excellent addition to a pollinator garden. An important ally in wildlife gardens, it attracts bees, butterflies, moths, and other beneficial insects. An ornamental native wildflower, it can self-seed and produce new plants the next year.Ī lovely companion plant, baby blue eyes grows well with succulents, cacti, and other wildflowers like the California poppy. The flowers grow in a cluster from the branch tips, on green or purple stems thick with white hairs.īaby blue eyes is easy to grow from seed and requires only moderate maintenance. Reaching a mature height of six inches with a spread of one foot, it has five-petaled flowers that are white in the center with brilliant baby blue hues from the mid-petal out to the tips. Forms of inelastic scattering, in which there is a shift in the wavelength, include Raman scattering and Brillouin scattering both of these have important implications for laser operation and in fiber optics.Its common name, baby blue eyes, tells the story of its bright and attractive features. Rayleigh and Mie scattering are elastic scattering processes, as there is no change in the wavelength of the incident light. This theory also applies to scattering particles that are electrically conductive. If the size of the scattering particles approaches the wavelength of light or exceeds it, then the complex Mie scattering theory applies and permits scattering of colors other than blue white is scattered at the largest sizes. If the size of the scattering particles is smaller than the wavelength of light, then the Rayleigh theory applies. Microscopic, molecular, and Raman spectroscopic approaches were used to reveal the cause of the microbial agent of rosy discoloration on these ancient paintings from Crypt of the Original Sin, in Matera, Italy. Raman spectroscopy, which employs the inelastic Raman scattering model, is a useful investigative tool. The variations in intensity of our sky are caused by the interplay of blue-light scattering by gas molecules, and white-light scattering by water drops and dust. ![]() White light is scattered by large particles, as occurs in fog and clouds. ![]() The blue of the sky appears deeper in the mountains because lower percentages of large aerosols are found at higher altitudes. The aerosols are washed out by rain, causing a deepening of the blue color of the sky following rainfall. The concentration of the aerosols is highest close to the ground, and so the blue color of the sky is lightest close to the horizon where large aerosols scatter white light. In Mie scattering, white light remains white after having been scattered by particles such as aerosols. German physicist Gustaf Adolf Mie (1868-1957) investigated this kind of scattering, and established that the intensity of light scattered by bigger particles is practically independent of its wavelength. When these aerosols are comparable to, or even larger than, the wavelength of the incident light, a different scattering model applies. The typical dimensions of such particles can lie anywhere between several hundred and more than ten thousand nanometers. Aerosols, such as particles of dust, smoke, droplets of liquids, minuscule crystals, bacteria, and pollens float in the lower atmosphere. However, the molecules of gases are not the only particles contained in the atmosphere. Blue wavelengths are scattered downwards and the sky appears blue. The Rayleigh theory holds for the scattering of visible light (with wavelengths ranging from roughly 400 to 750 nm) by atmospheric gas molecules with dimensions in the order of 1 nm (1 nanometer equals one billionth of a meter), which are considerably smaller than visible light wavelengths. The variations of blue across the sky cannot be explained using the framework of the Rayleigh theory, which describes scattering by particles much smaller than the wavelength of the incident light. Why does the sky get lighter closer to the horizon and seem bluer in the mountains? In this clear sky from a San Francisco bridge, #1 is the blue color higher in the sky, and #2 is closer to the horizon. The blue color gets lighter close to the horizon. Careful observation of the sky reveals that its color varies in its intensity depending on the angle of observation.
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