“Step index” refers to which of the following? October 5, 2022 by 8i9x6 The abrupt change in the refractive index from core to cladding The abrupt change in the refractive index for the core The abrupt change in the graded index from core to cladding The abrupt change in the graded index for the core See Answer The abrupt change in the refractive index from core to cladding