nbeo Formulae.txt

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Author:
cjensen20
ID:
266585
Filename:
nbeo Formulae.txt
Updated:
2015-02-12 18:49:49
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nbeo optics formulae
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nbeo optics formulae
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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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