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The coefficient of reflectivity R can be calculated from
 
The coefficient of reflectivity R can be calculated from
   −
<math> R = \frac{n _2 - n _1}{n _2 + n _1}^2</math>
+
<math> R = \left(\frac{n _2 - n _1}{n _2 + n _1}\right)^2</math>
    
where <math> n _1 </math> is the index of refraction for air and <math> n _2 </math> is the index of refraction for diamond. We can look these up and calculate R:
 
where <math> n _1 </math> is the index of refraction for air and <math> n _2 </math> is the index of refraction for diamond. We can look these up and calculate R:
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