If The existing provision for bad debts is to be increased by 50? than how we will show in revolution account

dear student,
since provision for bad debts is a liability it is credited when it has to be increased. Following entry is passed to increase provision for bad debts.

Revaluation A/C                                                        DR​​	50
To provision for bad debts		50
(being provision for bad debts increased)

 
It will come on debit side of revaluation account.

regards.