Letters that make index of refraction
a, o, d, e, f, n, c, r, t, i, x are letters that make 'index of refraction'
Words within index of refraction
fraction, index, act, re, ti, refraction, ref, AC, ex, on, in, action, CT, RA, DE, IN, ND, Io, ion, Ra, Re, Ac, Fr, In, Nd, Ti, refract are words within 'index of refraction'