The number of significant figures in 0.01500 is A) two. B) ...

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The number of significant figures in 0.01500 is
 
  A) two.
  B) three.
  C) four.
  D) five.

Question 2

A light ray in air strikes a glass plate whose index of refraction is 1.42. Some of the light reflects off the surface of the plate, but most of it enters the glass.
 
  If the angle of refraction is one-half the angle of reflection, the angle of refraction is closest to which one of the following angles? A) 45
  B) 43
  C) 41
  D) 39
  E) 37

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Answer to Question 1

C

Answer to Question 2

A