Unfortunately I have dropped the table with more than 10 lacs record and I don't have a backup of it.byt I need to retrieve itvback is it possible?

Quote:

A table with with more than 10 lacs record has been dropped unknowingly.

You just learned the hard way the reason why we do backups.

Quote:

And we maintain incremental backup so no luck we found because it happened 5 days back.

A backup which can't recover things the are more than 5 days old is not a good backup and may be not called a backup at all.
Incremental backup is a technique used to reduce the size of daily backup, but it can't be used alone. Usually, it is associated with regular full backups (weekly or monthly).
When planning a backup, you have to answer a few questions:
- What can't I afford to loose ?
- For how many days should I be able to recover data ?
- How long to recover the data from a backup ?
from the answers to these questions, you deduce how to organize the backups.
And whe, you plan the backup, always ask yourself "What append in worst case ?"

If your DBA says it's gone, it's gone - you will have to restore the "newest" backup you have and try to update it as best you can.
Let this be a lesson to you: never touch the production DB except with well tested software, and improve your backup regimen.

there is command used on oracle called ( rollback)
try your luck ^_^