| Earthquakes produce three main types of waves primary waves, secondary waves, and surface waves. |
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| Most of these secondary waves, when they meet along a common path, interfere with each other destructively, so that light does not leave the grating at all angles. |
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| As in all Ponzi schemes, the government said, Mr. Hsu paid interest to the first wave of investors with principal invested by secondary waves, and used this purported success to lure in more investors. |
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| These waves arrive at seismic stations before secondary waves, or S-waves, which shake molecules from side to side. |
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| At some exit angles, however, secondary waves from adjacent slits of the grating are delayed by exactly one wavelength, and these waves reinforce each other when they meet i.e., the crests of one fall on top of the other. |
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| A key finding was that large secondary waves were produced. |
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| If collimated light falls upon a transmission grating, the wavefronts successively pass through and spread out as secondary waves from the transparent parts of the grating. |
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