Jim's Mirror Making Page 1


  • The depth of glass to be removed, e depends on the focal length 
  • so for a 6" dia (r =3 inches) 48 inch focal length mirror. 
  •  3x3/96=.0468 inch
  • Note R=2x the focal length, 48x2= 96 inch
Glass to be removed
rxr/2xR= e

r = useful mirror radius
R= Radius of curvature of mirror

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