Difractive or Diffractive: How To spell?
The word Difractive is misspelled against Diffractive, an adjective meaning "That produces diffraction."
Diffractive has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Di & ractive which should not be misspelled with single 'F'
Wrong Spelling:  Di-f-ractive  Correct Spelling:  Di-ff-ractive 
Find more wrongly spelled words of Diffractive to spell it well.