Question : Accurate size of Index

On Oracle 9i or 10g,

After creating an index, either normal or bitmap:
How can you see its accurate size?
I don't mean the amount of extents taken from the free space.
I'm looking for something like the BLOCKS column from USER_TABLES view after performing an ANALYZE operation.

Thanks

Answer : Accurate size of Index

select sum(bytes/1024) Ks
from dba_segments
where owner=''
and segment_name = ''


hope it helps