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Question

What is the minimum value of the refractive index for a 904545 prism 
which is used to deviate a beam through 90 by total internal reflection ? 


  1. 32
  2. 3
  3. 2
  4. 53


Solution

The correct option is C 2
At face AB, the ray of light suffers no deviation. At face AC :


μ=1sin(θC)=1sin45
 μmin=2
 

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