Question

The graph below shows the variation of image distance (v) with the object distance (u) when an object is kept in front of a lens.

1. Identify the type of lens used.

2. What would be the magnification (more than 1/less than 1/equal to 1) if the object is placed between F and 2F of the above lens?

Answer 1

1. The lens used is a convex lens. The graph indicates that when an object is placed in front of the lens, an actual image is produced on the other side, with the image distance varying based on the object’s location. This behaviour is exhibited by a convex lens.
2. For a convex lens, when the object is placed between F and 2F, the image is produced beyond 2F. The image is real, inverted, and magnified. Therefore, the magnification is more than 1.