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/, Focus measured from incident surface. t, Thickness measured on principal axis, 
r, Radius of incident surface. s, Radius of silvered surface. 
d, Diameter of incident surface when aperture = 80°. ifofror.fi VA inrW — i 
D, Diameter of incident surface when aperture = 100°. UetracUve lndox “ 1 01K> ' 
