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168. A plastic has an absolute index of refraction of 1.45 for green light.  What is the speed of green light in the plastic?
  
A. 1.43 x 10 8 m/s         speed of light in a vacuum
n = --------------------------------------
        speed of light in medium

     
                                              speed of light in vacuum
speed of light in medium = ------------------------------------
                                                           n

     
                                              3.00 x 10 8 m/s
speed of light in medium = ---------------------- = 2.07 x 10 8 m/s
                                                      1.45

    
The Correct Answer is B.
B. 2.07 x 10 8 m/s
C. 4.35 x 10 8 m/s
D. 6.31 x 10 8 m/s