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An incidentary in air (n=1.0) is approaching the boundary with an unknown material at an angle...

  1. An incidentary in air (n=1.0) is approaching the boundary with an unknown material at an angle of incidence of 65.6°. The angle of refraction is 41.4°. Determine the index of refraction of the unknown material

  1. What is the speed of light in a material with an index of refraction of 1.75?

3. What is the critical angle for a light ray traveling in water with a refractive index of 1.33 that is incident on the surface of water above which air is with a refractive index of 1.00?

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Answer #1

Using Snell's Law; where n1 and n2 are refractive indices and i and r are incident and refractive angle.

  
  

  

Refractive index if unknown material is 1.38

Speed of light in medium with refractive index 1.75,

Critical angle at the interface of two media with refractive indices n1 and n2 is given by

   where n2 > n1

  

Critical angle is 48.75 degrees

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