Starting from very far away,an object is moved closer and closer to a convex lens,eventually reaching the lens.What happens to its image formed by that lens? (There could be more than one correct choice.)

Question

Quizplus · Accepted Answer

As the object moves closer to a convex lens, the real image formed by the lens will move away from the lens. Eventually, when the object is at the focal point of the lens, the image will be formed at infinity and will be a real image that is also infinitely far from the lens. As the object moves closer than the focal point, the image will become a virtual image which is closer to the lens than the original object. Therefore, the image eventually changes from a real image to a virtual image. Option E cannot be chosen as the size of the image depends on the distance between the object and the lens, and also the focal length of the lens.

Starting from Very Far Away,an Object Is Moved Closer and Closer