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
The correct answer is: C
Explanation
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.