12/28/2022 0 Comments Lines from blood in blood outIf you shine a red light on your arm, you will see some red light reflected back, and dark lines where the veins are, as the red light is absorbed by the haemoglobin. When it gets to the veins, the red light is absorbed by the haemoglobin (the protein that makes our blood red). Red light can travel pretty well through the skin and body tissues, reaching up to 5-10mm below the skin, which is where many veins are. Red light has a long wavelength – and this means it is less likely to be deflected by materials and can more easily travel through. But to explain why our veins look blue, we will look at just the red and blue ends of the spectrum. The light that hits our skin during the day is basically white, which is a mixture of all the visible wavelengths. To understand what colour our veins appear, we need to think about what happens to different wavelengths of light when they hit our skin, how far they can travel through our skin, and what happens when they get to our veins. We see something as a particular colour when light of that colour hits our eyes –either directly from a light source or reflected from a surface. Red light has a long wavelength (about 700 nanometres), violet light has a short wavelength (about 400 nanometres), and the rest of the spectrum is spread out in between. It opens in 1972, as the three are members of an East L.A. Different colours of light have waves of different lengths. Based on the true life experiences of poet Jimmy Santiago Baca, the film focuses on step-brothers Paco and Cruz, and their bi-racial cousin Miklo. And the distance between each trough is called a wavelength.
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