treated as singular The branch of optics that deals with refraction.
- ‘He was studying geometrical optics in the early 1650s, and began his own treatise on dioptrics at this time, continuing to work on it for the rest of his life.’
- ‘The manuscript outlined an important application of geometry that developed by the 10th century to a new concept of anaclastics or dioptrics, Rashid said.’
- ‘Volume I covers the dioptrics of the eye; Volume II, the sensations of vision; and Volume III, the perceptions of vision.’
- ‘In 1911 he received the Nobel Prize for his work on the dioptrics of the eye.’
We take a look at several popular, though confusing, punctuation marks.