What does "di" represent in optical terms?

In optical terms, "di" represents the distance from the lens to the image. This concept is fundamental in the study of lenses and image formation in optics. When using the lens formula, which relates object distance, image distance, and focal length, "di" provides essential information about where the image is formed relative to the lens.

Understanding "di" is crucial for determining whether the image produced is real or virtual. A positive value for "di" indicates that the image is located on the opposite side of the lens from the object, producing a real image that can be projected onto a screen. Conversely, a negative value implies that the image is virtual, formed on the same side as the object.

The other options refer to different optical properties, such as the height of the object or the height of the image, which are important in analyzing magnification but do not define "di." Focusing on "di" helps clarify the relationship between the image location and the lens, a key aspect of optical physics.