1. Actual Depth= - ANS-(n2/n1) (Apparent depth)
2. n1= index the observer is in
3. n2= index the cloth is in
4. Angle of occurrence= - ANS-I=r+d
5. I= attitude of incidence
6. r= angle of refraction
7. d= deviation
8. Angle of mirrored image= - ANS-perspective I= attitude r
9. I= angle of occurrence
10. r= perspective of mirrored image
11. Apparent Depth= - ANS-(n1/n2) (Actual depth)
12. n1= index the observer is in
13. n2= index the material is in
14. Binocular Decentration (Per eye) - ANS-(FPD-PPD)/2
15. FPD= Frame PD
16. PPD= patient binocular distance PD
17. Brewster's Equation (Polarization) - ANS-tan i= ni/nr
18. i= perspective of incidence
19. ni= index of incident material
20. nr= index of reflecting material
21. Critical attitude= - ANS-sin^-1(nr/ni)
22. D Refractive= - ANS-(n refractive- 1)/zero.53 x D marked
23. D marked= lens clock analyzing
24. Dioptric formulation - ANS-f=1/D
25. D= dioptric strength
26. f= focal duration in meters
27. Dioptric electricity= - ANS-D= (n-1)/r
28. r= radius in meters
29. D= Dioptric electricity of a curve
30. n= index of refraction
31. Displacement in cm= - ANS-prism diopters x distance in m
32. Distance in m= - ANS-Displacement in cm/ prism diopters
33. Effective Diameter= - ANS-2x the longest radius or
34. longest diameter in any course
35. Focal length - ANS-D=1/f
36. D= dioptric energy
37. f= focal length in meters
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