For the double-slit interference, describe what happens to the observed pattern when:
a. The slit width is held constant, but the spacing between them increases.
b. The spacing between the slits is held constant, but the width of each increases.

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igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods