Final answer:
The behavior of light waves is different in a P tube compared to an L tube.
Step-by-step explanation:
In a P tube and an L tube, you can expect different outcomes when observing certain phenomena. One example is the behavior of light waves. In a P tube, the light waves will experience a phase change of 180 degrees upon reflection, resulting in interference patterns that are inverted compared to the original source. On the other hand, in an L tube, the light waves will not experience a phase change upon reflection and the interference patterns will be similar to the original source.
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