This category deals with optical measurements including photometry and radiometry. For help choosing between these two sub-categories, see this diagram (or full page) showing the corresponding sets of measurement-units, and their interrelations. For all other sub-categories, see below.
This category has the following 5 subcategories, out of 5 total.
The following 36 pages are in this category, out of 36 total. This list may not reflect recent changes.