Applicants for German citizenship will be required to explicitly affirm Israel's right to exist under a new citizenship law which came into effect on Tuesday.

The new law shortened the number of years that a person must have lived in Germany in order to obtain a passport, from eight to five years. It will also allow first-generation migrants to be dual citizens.

As part of the shake-up, new questions were added to the country's citizenship test, including about Judaism and Israel's right to exist.