Posted by **Please help if you can...** on Wednesday, October 24, 2012 at 3:52am.

I am posting this question again as noone has answered it yet.

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?

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