Spherometer Radius

Ball Diameter: 

Distances between the outside of each ball:

A:   B:   C:  



Spherometer Radius: 

Mirror Radius/Focal Length Calculation
(Needs Spherometer Radius and Ball Diameter above)

Sagitta: 



Mirror Focal Radius: 

Focal Length: 


Focal Ratio Calculation (Do all Previous Calcs first)

Mirror Diameter: 



Focal Ratio: 


Focal Length Calculation

Mirror Diameter: 
Focal Ratio: 



Focal Length: 
Focal Length Feet: (Only if inches used)


Sagitta Calculation 
(Needs Spherometer Radius above)

Mirror Diameter: 
Focal Ratio Desired: 



Sagitta Needed: