Author Question: An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius ... (Read 428 times)

luvbio · **on:** Jul 28, 2018

An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius R2, with R1 < R2 . Both positive radii are measured from the same side with R2 being the side closer to the eye. Is this convex-concave lens a converging lens or a diverging lens?
a. This is neither, since a lens cannot be made this way.
b. This is a diverging lens.
c. This can be either a converging or diverging lens, as more information is needed for a final determination.
d. This is a converging lens.

Question 2

Boltzmann's constant, kB, may be derived as a function of R, the universal gas constant, and NA, Avogadro's number. Which expresses the value of kB?
a. NAR2
c. R/NA
b. NAR
d. NA/R