Question

under what circumstances will an image be located at the focal point of a lens or mirror?

Answer 1

Answer:

Under what circumstances will an image be located at the focal point of a lens or mirror? When object is placed at infinity then light rays parallel to the axis of mirror or lens meet or appear to meet at focal point of mirror and lens and hence formed image.

Answer 2

Answer:

Under what circumstances will an image be located at the focal point of a lens or mirror? When object is placed at infinity then light rays parallel to the axis of mirror or lens meet or appear to meet at focal point of mirror and lens and hence formed image.