- #1
Blacky&Imy
- 3
- 0
Hello!
I am preparing an exam about optics and I can't understand a formula.my problem is at the end of the second page (the explanation is in Italian, but the formulas are easy to read for everybody).
I can't understand how in the last step
f=R/2 - (1+b) * r^2/4R etc they found -(1+b)
can somebody help me please?
I am preparing an exam about optics and I can't understand a formula.my problem is at the end of the second page (the explanation is in Italian, but the formulas are easy to read for everybody).
I can't understand how in the last step
f=R/2 - (1+b) * r^2/4R etc they found -(1+b)
can somebody help me please?