  It is accepted that quasars are powered by supermassive black holes (SMBH)
with masses in the range 10^6 - 10^9 solar masses in their cores. Occasionally,
compact stars can plunge into SMBH. In addition, there may be a number of such
compact objects circling the central SMBH in any given quasar. Both of these
processes are known to emit gravitational waves. LISA has the right sensitivity
to detect these waves. We show that gravitational lenses amplify the amplitudes
of these gravitational waves just as they amplify the observed light of
quasars. Given the geometry of the lensing configuration, this amplification
can be as large as a factor of 2 to 10, allowing the waves to be above the
detection threshold of LISA. We also show that waves from lensed quasars arrive
with time delays which are much larger than the coherence time of the
gravitational waves, making interference effects negligible. Thus, a simple
geometrical optics application leads to the lensing theory of gravitational
waves. In this context, we analyze and show in this preliminary analysis that
there is an enhancement of the amplitudes of gravitational radiation coming
from observed lensed quasars.
