Which shows the correct lens equation?

The inverse of f equals the inverse of d Subscript o Baseline times the inverse of d Subscript I Baseline.
The inverse of f equals StartFraction d Subscript o over d Subscript I Baseline EndFraction plus StartFraction d Subscript I Baseline over d Subscript o Baseline EndFraction.
The inverse of f equals the inverse of d Subscript o Baseline minus the inverse of d Subscript I Baseline.
The inverse of f equals the inverse of d Subscript o Baseline plus the inverse of d Subscript I Baseline.



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