# physics

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A technician wishes to produce the lens +2.00DS/+2.00DC x90 in toric form, in CR39 with a -5.00 base curve. After finishing the toroidal surface with the CR39 tool it is discovered that, in error, they have used a plastics material of refractive index 1.56. Which CR39 tool must now be used to work the front surface?

• physics -

Hi, Need Help and Can anyone help. There will be someone to answer your question shortly. Just be patient. I have to be patient too when i want someone to help me. :)

BTW hope you get you question answered.

• physics -

BTW try not to post the same question over and over because they will sometimes get removed.

• physics -

First time I have used this-didnt think my posts where showing!lol

• physics -

lol :) I do that sometimes

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