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For uniform laminar flow over a flat plate, the thickness of the boundary layer, $\delta$ at a distance $x$ from the leading edge of the plate follows the reaction :

- $\delta \left ( x \right )\alpha \:x^{-1}$
- $\delta \left ( x \right )\alpha \:x$
- $\delta \left ( x \right )\alpha \:x^{1/2}$
- $\delta \left ( x \right )\alpha \:x^{-1/2}$