You Do Need power plug adapter while traveling from Israel to Denmark.

Here is Why You Need An Adapter

The outlet and plug type used in Denmark are C, E, F and K and in Israel are C and H. This is how they look like.

Israel

In Israel, outlets of type C and H are in use.

Type C

Type H

Denmark

In Denmark, outlets of type C, E, F and K are in use.

Type C

Type E

Type F

Type K