In optics, what does "ho" denote?

In optics, "ho" specifically refers to the height of the object. This terminology is part of the conventions used in the study of lenses and mirrors where different variables are often denoted by specific letters.

Understanding this notation is crucial as it helps to differentiate between various parameters needed to analyze optical systems, such as the relationship between the object and the image formed by a lens or mirror. The height of the object is used in formulas calculating magnification and other properties related to image formation. This distinction allows for precise calculations and a better understanding of how the optical system functions.