# physics

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A technician wishes to produce the lens +2.00DS/+2.00DC x90 in toric form, in CR39 (n=1.498) 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 -

Ok i will try to look it up on the internet and see if i can find the answer.

• physics -

Oh, bless ya. I have tried doing the question but don't know what to do. I tried transposing the prescrition first to +4.00DS/-2.00DC x 180 then not sure what to do

• physics -

I did it your way and got -360. Did you get that? I was just wondering. I have figured it out yet.

• physics -

Nope, how did u get -360? I'm stuck not sure what to do next

• physics -

Yeah..............Now I'm confused. :(

• physics -

Never mind, don't think anyone has the answer to this!lol Thanks for trying though

• physics -

But this is a good website. MS. Sue is good a English so is writeatecher. Steve is good at math.

• physics -

Great, thank you :)

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