Question

student obtained clear image image of Window grill on the screen but the teacher told him to get the image of a tree far away Instead of window to get a clear image the lens must be

Answer 1

In order to get a clear image of the tree the student should use a concave lens and the lens should be moved slightly towards the screen.

Since only a concave mirror produces image larger than the actual object size hence only a concave mirror can be used to take the image of a far away object.

In order to get a clear image of the far away tree the lens should be moved towards the screen to adjust the image projection on the screen according to the focal length of the lens.