State the surface powers required to produce the following lenses with +6.25D front curves.
a. -0.50 DS
b. +0.50 DS
c. +1.75 DS
Is a= -6.75D?
b= -5.75D?
c= -4.75D?
a. -0.50 DS
b. +0.50 DS
c. +1.75 DS
Is a= -6.75D?
b= -5.75D?
c= -4.75D?