Assertion: lens's power | /r/HasProperty | obtained
Facets:
value: next
type: DEGREE
Source sentences:
text: If the lens is made of glass with some other index n 2 {\displaystyle n_{2}} , the true optical power of the surface can be obtained using
text: The optical power of the lens is instead obtained as follows:
text: Next, the optical powers of each surface are obtained: