A charged particle passes through a uniform electric field existing between the parallel plates of a capacitor. The length of each plate is `l`. Its initial velocity is parallel to the plates. When it emerges from the field, its deflection from its initial path is `delta`, and its angular deflection from its initial directioin `theta`. Then,` theta` is equal to
A. `delta//l`
B. `2delta//l`
C. `delta//2l`
D. none of these
