JERUSALEM — An Israeli court on Wednesday sentenced a border police officer to nine months in prison for the fatal shooting of a Palestinian teenager during a protest in the West Bank in 2014.

The relatively light sentence was handed down as part of a plea deal with the prosecution. The court found the shooting unjustified because the youth was not posing any threat to Israeli forces when he was shot.

The officer, Ben Deri, was convicted of causing death by negligence in the shooting of Nadeem Nawara, 17, who was hit in the chest with a live round. The forces at the scene had been instructed to use only rubber-coated bullets, where necessary, to disperse the stone-throwing demonstrators in Beitunia, a town on the edge of Ramallah in the West Bank.

Nadeem’s father, Siam Nawara, told reporters at the court that the sentence was “unjust.” The prosecution had requested that Mr. Deri be sentenced to 20 to 27 months in prison.