No, the refractive indices are not the same. Upon polymerization, there is a decrease of volume or thickness caused by contraction and an increase of refractive index from monomer to polymer caused by the combined effects of shrinkage & chemical conversion.
The optical properties of monomers change during polymerization with the refractive index rise by polymerization. the refractive index of the matrix rises due to increased density
Thankyou for your response Dr. Amin Shivandi and Dr. Nizar Matar. Can you help me to findout the refractive indices of the polymer practically. I have no idea how to measure refractive index of the polymer. Please suggest me some practical ways to do it.