You Do Need power plug adapter while traveling from India to Vatican City.

Here is Why You Need An Adapter

The outlet and plug type used in Vatican City are C, F and L and in India are C, D and M. This is how they look like.

India

In India, outlets of type C, D and M are in use.

Type C

Type D

Type M

Vatican City

In Vatican City, outlets of type C, F and L are in use.

Type C

Type F

Type L