Which is the definition of refraction

Refraction is the change of direction that a light ray experiences when passing from a transparent medium (water, glass, air) to another where the velocity of propagation of the wave is different. For example, light propagates more slowly in any medium than in a vacuum. Based on this, there are indices of refraction for each material, which are actually a comparison between the speed of light of a transparent medium and that of the vacuum. For example, the refractive index of water is 1,333. This means that in a vacuum the speed of light is 1,333 times faster than in water. Therefore when a ray of light passes from a medium like air to water, it changes its direction.

show the wavelengths of a wave. show the crests of a wave.

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

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