Homework Help: optics

Posted by please help on Monday, November 26, 2012 at 11:44am.

Transpose the prescription
-0.75DS/-3.25DCx30 to the toric form with a capstan-form surface which has a +2.50D base curve

optics - please help, Monday, November 26, 2012 at 11:57am
I have transposed the presciption so that cyl is in a plus form
-4.00DS/+3.25DCx120,
what do I do next?
Please help if you can

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