Formula for resultant focal length of two lenses placed at a distance
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Explanation:
I have found the formula for the effective focal length ff of two thin lenses with focal lengths f1f1 and f2f2 separated by distance dd to be
1f=1f1+1f2−df1f2.
1f=1f1+1f2−df1f2.
However, I can't seem to find how ff is defined. Is it the distance from the first lens to the final focal point or the distance from the second lens to the final focal point? Or neither?
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