Refraction

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Students of class 10th doing the practical of refraction.

Refraction is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another.

Why is refraction important.

Consider a wave going from one material to another where its speed is slower as in the figure. If it reaches the interface between the materials at an angle one side of the wave will reach the second material first, and therefore slow down earlier. With one side of the wave going slower the whole wave will pivot towards that side. This is why a wave will bend away from the surface or toward the normal when going into a slower material. In the opposite case of a wave reaching a material where the speed is higher, one side of the wave will speed up and the wave will pivot away from that side.

    


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