Originally Posted by
MakeOptics
- Calculate the refraction index of a thin lens, which measures are : F1 = +5,25D and F2 = -1,75D, being the power obtained by neutralization of +6,00D. The Sag meter used were calibrated to CROWN glass and possued a sistematic error of -0,25D.
The simple way to work this problem out is to first find out the clocked power = +5.25 -1.75 = +3.50
Now used the clocked power, the material power, and the clocked index to determine the material index
6.00 = +3.50 * (Nmat - 1)/(1.523-1)
Nmat = 1.8966 (this is the index after doing the math)
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