# Tag Info

In the equation: $$T_2 = T_1 + \left( \frac{1}{v} \frac{2h}{\cos (\theta)} \right)$$ the bit in brackets is presumably the time taken for some signal to travel from the surface down the red line, reflect at the first bounday then travel back to the surface again. Let us pick out half the red triangle: If the signal velocity is $v$, and the length of ...