The length 3.76 mm is multiplied by 0.0232 mm. The appropriately rounded product is
A. 0.082 
B. 0.09
C. 0.087
D. 0.0872
E. 0.08723
D. 0.0872
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An optic fiber is made of clear plastic with index of refraction of 1.50, surrounded by air. For what angles of incidence ? will light remain within the plastic fiber?
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What will be an ideal response?