# nbeo Formulae.txt

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1. Angle of deviation
d = <a(n-1)
2. Equivalent power formula
FEQ = F1 + F2 - (t/n) F1F2
3. Back Vertex power
Fback = (F2 / 1 - (t/n)F2) +F1
4. Effective vergence(contact lenses)
Fef = F/1-xF
5. Lens clock formula
FL = (nlens - 1/nLC - 1) (FLC)
6. Power
F = (n2-n1)/r
7. Min blank size
ED +2(d) +2mm
8. Decentration per lens
d= (FPD - PD) / 2
9. Spec mag
img size (cc)/img size (sc)
10. Shape formula
Shape 1/1-(t/n)F1
11. Spec mag for thick lenses
Shape x power
12. Power
1/1-xFb
13. Javal's rule
1.25 +/- .50 (+ ATR / - WTR)
14. Vergence power
L'= L+F
15. Power of a mirror
Fmirror = 2n/r
16. Keratometry conversion
F = 337.5/r
17. Lens thickness
T = tc-te = s1-s2
18. Relative distance mag
M = original distance/new distance
19. Simple magnifier mag
M = F/4
20. Stand Magnifier mag
M = 1+F/4
21. HH magnifier mag
w = d/F l
22. Telescope tube length
TL = (1/Fobj + 1/Focl)
23. Telescope mag
M= Focl/Fobj = entp/extp
24. Spec mounted mag
Fcap x Mtele
25. Linear mag
M = himg/hobj = L/L'
26. Apparent depth
((n1/l) = (n2/l' ))
27. Prism displacement
? = displacement in cm / distance in m

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 Author: cjensen20 ID: 266585 Filename: nbeo Formulae.txt Updated: 2015-02-12 23:49:49 Tags: nbeo optics formulae Folders: Description: nbeo optics formulae Show Answers:

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