A particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having d = $\frac{3mv}{5qB} at angle of 53°$ to the boundry of magnetic field. Find the angle $\theta$ in the diagram 




$$\begin{gathered} 1. 37° \\ 2. 60° \\ 3. 90° \\ 4. 45° \end{gathered}$$