  We present a study of far and near-ultraviolet emission from the accretion
disk in a powerful Seyfert 1 galaxy IC4329A using observations performed with
the Ultraviolet Imaging Telescope (UVIT) onboard AstroSat. These data provide
the highest spatial resolution and deepest images of IC4329A in the far and
near UV bands acquired to date. The excellent spatial resolution of the UVIT
data has allowed us to accurately separate the extended emission from the host
galaxy and the AGN emission in the far and near UV bands. We derive the
intrinsic AGN flux after correcting for the Galactic and internal reddening, as
well as for the contribution of emission lines from the broad and narrow-line
regions. The intrinsic UV continuum emission shows a marked deficit compared to
that expected from the "standard" models of the accretion disk around an
estimated black hole mass of 1-2x10^8Msun when the disk extends to the
innermost stable circular orbit. We find that the intrinsic UV continuum is
fully consistent with the standard disk models, but only if the disk emits from
distances larger than 80-150 gravitational radii.
