A student obtained a sharp inverted image of a distant tree on the screen placed behind a convex lens. He then removed the A student obtained a sharp inverted screen and tried to look through the lens in the direction of the object. He would now observe:

[A] a blurred image on the wall of the laboratory

[B] an erect image of the tree on the lens

[C] no image as the screen has been removed

[D] an inverted image of the tree at the focus of the lens