Refraction is the result of a wave's direction changing as it travels from one medium to another due to a change in speed.
Refraction is the term for the bending of light as it passes through transparent materials (it also occurs with sound, water, and other waves). We are able to create lenses, magnifying glasses, prisms, and rainbows because to this bending caused by refraction. Even our eyes rely on this light bending.
When light enters a medium from another, its speed changes, which results in refraction. Because of the decrease in speed, light bends toward the normal when it passes from air to water.
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