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Line 59: Line 59:  
<math>( d _2 - d _1 ) = 2 \tau / V _d </math>
 
<math>( d _2 - d _1 ) = 2 \tau / V _d </math>
   −
and
+
so
    
<math>d _2  = 2 \tau / v _d + d _1</math>
 
<math>d _2  = 2 \tau / v _d + d _1</math>
Line 67: Line 67:  
<math>s = d _1 v _a / 2</math>
 
<math>s = d _1 v _a / 2</math>
   −
where <math> v _a </math> is the speed of light in air.
+
where <math> v _a </math> is the speed of light in air. We can rewrite this in terms of <math> d _1 </math>:
    
<math>d _1 = 2 s / v _a</math>
 
<math>d _1 = 2 s / v _a</math>
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