L O.

asked • 07/09/14

help with refraction

refraction occurs when
 
a.  a wave strikes and is re-emitted from an object
b.  there is a difference in the speed waves  
c.  a wave bends around a barrier
d.  the crest of one wave overlaps the crest of another
 
 
I think the answer is either b or c
 
thanks

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