Destroy Game object when leaves camera view

Hi. i am using a csharp script for unity 4.5 and for a bullet game object. When the character ship shoots the bullet i need it to destroy when it leaves the camera view

i am not that good at scripting or understanding it well and my teachers hint was trigger volumns or when it becomes invisible so how do i make the gameobject destroy once it has fired and then become invisible. I have searched this before but there codes dont work for the current unity. So any help asap would be fantastic.

You could put trigger colliders just around your camera view, and then put something like this on the bullet script.

void OnTriggerEnter(Collider other)