What is the minimum index of refraction of a clear material if a minimum thickness of 127 nm , when laid on glass, is needed to reduce reflection to nearly zero when light of 675 nm is incident normally upon it? assume that the film has an index less than that of the glass. express your answer using three significant figures. nmin n min = 1.33 submitprevious answers correct significant figures feedback: your answer 1.327 was either rounded differently or used a different number of significant figures than required for this part. part b what is the minimum index of refraction of the material if the film has an index greater than that of the glass. express your answer using three significant figures.