WAEC - Physics (2024 - No. 21)
For a convex lens to form a real image, the distance between the object and the screen will be:
equal to the focal length of the lens
less than the focal length of the lens
twice the focal length of the lens
four times the focal length of the lens
Forklaring
Twice the focal length of the lens: this is because, for a real image to be formed, the object must be placed outside the focal length of the lens, typically at a distance greater than twice the focal length.