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answ2. You may see this for yourself at the seashore.

Or better when a wave approaches a definite barrier such as a sea wall.

A gedanken experiment. (Thought experiment). Assume you have a rigid wall horizontally in front of you, and you are looking down on it. (Draw a line across your paper, this is the wall.) [Just consider a short section of the wavefront - you may assume the rest of the wave behaves the same.]

Draw this part of the wavefront just ready to hit the wall.

Your wave section approaches the wall from an angle, and one part of the wavefront hits the wall first.

It is reflected at a complementary angle, and moves off. (This is an ideal experiment where none of the energy is lost at the reflection.)

The remainder of your wavefront section continues to meet the wall, and be reflected from it, parallel to the first bit.

Experiment ends, your section of wavefront has all been reflected, with the relative positions of the parts of the wave still in correct relationship to each other.

Except that what was the left edge of the (segment of) wavefront is now the right edge! It has been reflected! - A mirror reflection.

end.

Read more: http://wiki.answers.com/What_Describes_the_behavior_of_waves_when_they_strike_a_surface#ixzz16IVMfNkc

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