Assertion: eyepiece's lens | /r/HasProperty | positive
Facets:
value: conventionally
type: MANNER
Source sentences:
text: Since converging lenses are conventionally positive (or of positive optical power) and diverging ones negative (or of negative optical power), we can also say that the distance between the objective and the eyepiece is equal to the algebraic sum of their focal lengths.
text: (B) Smyth-type eyepiece has a negative front lens - in effect an integrated Barlow lens - separated from the positive lens froup following it.
text: In reality, in re-imaging the entrance pupil (aperture opening), an eyepiece acts as any positive lens does - in other words, it suffers from under-correction.