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General
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Question

A light ray is incident perpendicularly to one face to a 90 to the power of ring operator end exponent prism and is totally internally reflected at the glass-air interface. If the angle of reflection is 45º, we conclude that the refractive index n is

  1. n less than fraction numerator 1 over denominator square root of 2 end fraction    
  2. n greater than square root of 2    
  3. n greater than fraction numerator 1 over denominator square root of 2 end fraction    
  4. n less than square root of 2    

The correct answer is: n greater than square root of 2


    table row cell text end text text i end text text > end text text c end text text end text text f end text text o end text text r end text text end text text I end text text T end text text R end text text end text end cell row cell therefore 45 to the power of ring operator end exponent greater than s i n to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 1 over denominator n end fraction close parentheses rightwards double arrow n greater than square root of 2 end cell end table

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