  We study the efficiency of radiation in driving jets around black holes.
Including general relativity for the radiation driving, we also show that the
radiation field is affected by strong gravitational field in non linear manner,
making general relativistic analysis more significant. We obtained internal
shocks in jets close to the base, as a result of non-conical cross section and
nature of radiation field on jet dynamics. Theoretical evidence of internal
shocks is significant, as these are required to explain high energy tail of the
spectra of radio sources. Under thermal and radiative driving, jets with
electron-positron composition are obtained to be achieving relativistic speeds
up to Lorentz factors $\gamma \sim 10$ while for electron-proton composition it
is $\gamma \sim 2$ for luminous discs. We also showed that extragalactic jets
around AGNs are faster than those around microquasars. We obtain that through
Compton scattering, relativistic jets generated with non relativistic
temperatures, are efficiently heated by temperatures up to $T \sim 10^{11-12}
\rm K$. Further, we obtained transonic solutions with relativistic terminal
speeds, for bound state of the jet at the base (that is, generalized Bernoulli
parameter $E < 1$), where gravity is dominant over thermal driving. In Thomson
scattering regime no transonic solutions could be obtained. This shows that
radiation, in fact, has greater role as it not only accelerates the unbound
matter of the jets, but the acceleration is effective even in absence of any
other accelerating agent such as thermal acceleration. A detailed analysis of
dependence of jet variables upon various parameters like plasma composition,
magnetic pressure in the disc, luminosity, accretion rate, jet geometry and jet
launching energy etc, is carried out.
