417. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) September 6, 2025 by Admin A. X1.5 B. X0.8 C. X-1.5 D. X-0.8 ✅ The correct answer is option B.