You Do Need power plug adapter while traveling from Cambodia to Lebanon.

Here is Why You Need An Adapter

The outlet and plug type used in Lebanon are C, D and G and in Cambodia are A, C and G. This is how they look like.

Cambodia

In Cambodia, outlets of type A, C and G are in use.

Type A

Type C

Type G

Lebanon

In Lebanon, outlets of type C, D and G are in use.

Type C

Type D

Type G