Glass.
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Asphalt. Macadam is another common name for the process. To Macadamize something is to pave it with asphalt.
the smooth-sided is smooth but the stepped has a six huged steps at the top for the robbers
Any smooth surface will reflect light. The better question is "How much light does each kind of smooth surface reflect?"
I am not sure what situation you are talking about; usually such curves should be smooth.
f is a piecewise smooth funtion on [a,b] if f and f ' are piecewise continuous on [a,b]