Bifoclas

Question 0

What is the equation to find Fb?

Answer 0

Fb=F1-AK

Question 1

What is the equation to find Fc?

Answer 1

Fc= F1-(AK)

Question 2

What is the ratio to find K?

Answer 2

K= nm-1
—–
ns-nm

Question 3

How to find Fs

Answer 3

Fs= A(K+1)

Question 4

How to work out Ts

Answer 4

Ts= Y(sq)x F
———-
200(n-1)

Question 5

Hot to find ts(top)

Answer 5

Ts(top) =Ts-s’

Question 6

What are the three different equations for back surface segs?

Answer 6

Fc= F2-AK

Fb=Fc+F1

Or

Fb=F-AK