| http://www.w3.org/ns/prov#value | - 's number is a function of a focal length and an Abbe's number of a refractive lens except said diffractive surface, as defined by: ##EQU3## where ??ij is an Abbe's number of a j-th lens in said i-th lens group and fij is a focal length of the j-th lens in said i-th lens group. 5.
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