| Definition: | quotient of the flux, Φi, indirectly reaching a surface in a cavity, and the primary flux, Φo, directly received by another surface, the flux Φi resulting from the interreflection undergone by the flux Φo Note 1 to entry: The interreflection ratio has unit one. Note 2 to entry: This entry was numbered 845-09-75 in IEC 60050-845:1987.
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