Question

During an experiment on a thin-lens system, its initial state produces a real and inverted image and its final state produces a virtual, upright and enlarged image. Which of the following statements best illustrates on the kind of change occurred for the thin-lens system?

• A. The object is moved from a point outside the radius of curvature to a point within the focal length of a concave lens.
• B. The converging lens is swapped for a diverging lens to create the switch in orientation.
• C. The object is moved from a point outside the focal length to a point within the focal length of a convex lens.
• D. An additional converging lens was placed outside the focal point of the original lens.

Answer 1

The correct option is C The object is moved from a point outside the focal length to a point within the focal length of a convex lens.

In a convex lens arrangement, when we move the object from beyond centre of curvature towards focus, the image obtained is real and inverted. But as soon as the object is placed between focus and pole of a convex lens, the image obtained is virtual, erect and enlarged.