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Answers
Multiple reflection of light is the reflection of light back and forth several times between reflecting surfaces. If a reflected light ray is reflected again on being incident on another surface, it is termed multiple reflections. Multiple reflections are used in periscopes.
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Multiple Reactions
In many processes, you put your reactants together and try to make a product. Often, there are "side reactions" and "byproducts" to worry about.
For instance, consider the combustion of methane:
methane burns
The complete combustion reaction to form carbon dioxide is more desirable than incomplete combustion to carbon monoxide.
Yield and Selectivity are defined to help us quantify the impact of competing reactions:
defns
Usually, high yields and selectivities are good.