Will a combination lens have symmetric focal length on either side?
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Yes,it as the symmetric focal length on both side
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the effective focal length ffof two thin lenses with focal lengths f1f1 and f2f2separated by distance dd to be
1/f = 1f/1 + 1/f2 − d/f1f2.
1/f = 1f/1 + 1/f2 − d/f1f2.
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