You Do Need power plug adapter while traveling from Bahrain to Bosnia & Herzegovina.

Here is Why You Need An Adapter

The outlet and plug type used in Bosnia & Herzegovina are C and F and in Bahrain is G. This is how they look like.

Bahrain

In Bahrain, outlets of type G are in use.

Type G

Bosnia & Herzegovina

In Bosnia & Herzegovina, outlets of type C and F are in use.

Type C

Type F