Translations:Point of maximum depth/1/en

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We have found the parametric equations for the circular raypath that starts at the origin and makes an angle with the positive y-axis (Figure 13). This raypath represents a diving wave that reaches a maximum depth at point and then returns to the surface. The tangent to the raypath is horizontal at D. Thus, the angle from the vertical is , that is, at the depth point. Inserting and in the above parametric equations, we obtain the coordinates of the depth point as