  In this paper, we establish transcendental entire function $A(z)$ and
polynomial $B(z)$ such that the differential equation $f''+A(z)f'+B(z)f=0$, has
all non-trivial solution of infinite order. We use the notion of \emph{critical
rays} of the function $e^{P(z)}$, where $A(z)=d(z)e^{P(z)}$ with some
restrictions.
