ABO Advanced Formulas Solved 100%

Resolving Prism= - ANSWER-Vertical = (prism)(sin angle) Horizontal = (prism) (cos angle) Resultant Prism= - ANSWER-The square root of (Vertical prism^2) + (Horizontal prism^2) tan a=V/H Shape Factor= - ANSWER-1/1-(T/NxF) T=center thickness in m N= index of refraction of lens material F= front base curve Power Factor= - ANSWER-1/1-(HxD) H= vertex distance plus 3 mm in m D= Dioptric power Spectacle Magnification= - ANSWER-shape factor x power factor 1/ 1-(T/NxF) x 1/1-(HxD) Power in Oblique Meridians= - ANSWER-Total power = sphere power + cyl power x sin^2 (O) Snell's Law= - ANSWER-N1 sin i = N2 sin r N1= index of refraction of incident medium i= angle of incidence N2= index of refraction of refracting medium r= angle of refraction Angle of reflection= - ANSWER-angle I= angle r I= angle of incidence r= angle of reflection Angle of incidence= - ANSWER-I=r+d I= angle of incidence r= angle of refraction d= deviation Index of refraction= - ANSWER-Speed of light in a vacuum/Speed of light in the medium Prentice Rule= - ANSWER-Prism= (hxd)/10 h=distance moved in mm D= total dioptric power for the meridian