*34.  The drawing shows a ray of light traveling from point A to point B, a distance of 4.60 m in a material that has an index of refraction n1. At point B, the light encounters a different substance whose index of refraction is n2 = 1.63. The light strikes the interface at the critical angle of qc = 48.1°. How much time does it take for the light to travel from A to B?

 

w1380

 

 

We find n1 by using the critical angle

 

 

 

 

 

 

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