Thin Lens Equations                  
Determine the focal length of a thin lens    
Material index  
Radius 1 mm (positive is convex on R1) 1/f = (n-1)*(1/R1-1/R2) in air  
Radius 2 mm (negative is convex on R2)  
Focal Length mm  
Determine the Image distance  
Focal length mm   1/f = (1/O-1/I)  
Object distance mm  
Image distance mm  
  Handy optics calculations  
  from LightMachinery Inc.