You Do Need power plug adapter while traveling from Burkina Faso to Sri Lanka.

Here is Why You Need An Adapter

The outlet and plug type used in Sri Lanka is G and in Burkina Faso are C and E. This is how they look like.

Burkina Faso

In Burkina Faso, outlets of type C and E are in use.

Type C

Type E

Sri Lanka

In Sri Lanka, outlets of type G are in use.

Type G