  We have extended our result on defocussing of world lines [1] by modifying
gravity in the early epoch by a 5-d theory with scalar $\psi(r)$. The
acceleration term in the Raychaudhuri equation has been shown to be positive
for flat FRW metric. The scalar $\psi(r)$ satisfies a non-linear differential
equation which is solved. Though singular, the acceleration term turns out to
be finite. With this, the equations for the Hubble parameter H(t) and the scale
factor $a(t)$ are obtained. These are analyzed using 'fixed point analysis'.
Without the scalar field, the age of the universe is finite showing a beginning
of the universe and with out bounce. With the contribution of the scalar
included, the age of the universe is shown to be infinite, thereby resolving
the singularity. The scale factor $a(t)$ exhibits classical bounce, the bounce
being proportional to the effect of the scalar field. The effect of the 5-d
gravity in the early universe is to cause defocussing of the world lines, give
infinite age of the universe thereby resolving the big bang singularity and
classical bounce for the FRW scale factor.
