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The phenomenon you talk about is called "Refraction". You an find an explanation, with diagrams, in the Wikipedia article on "Refraction". Basically, the change of direction is related to the change in the speed of the wave.

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10y ago
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14y ago

When a light wave moves from one medium to another of different density (eg air to water), it refracts (bends) and slows down. The refracted angle of a ray of light can be calculated using snell's law:

n(1)*Sin(angle1) = n(2)*Sin(angle2)

where n(1) = speed of light in vacuum/speed in medium(1)

The higher the density the more the light is refracted and slowed down.

A fraction of the wave will also be reflected. The larger the density difference, the more of the wave is reflected. If the wave reaches a boundary of greater density, the reflected ray undergoes a 180 degree phase shift.

If you wanted to know the behaviour of other waves, then i dont know, sorry.

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12y ago

It is refracted.

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12y ago

Refraction

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3y ago
DIGEST MY COCK

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7y ago

speed

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Q: When a wave crosses a surface at an angle from one medium into another why does it pivot or turn as it moves across the boundary into the new medium?
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