Solve using Matlab with the NEWTON RHAPSON METHOD

the following empirical relationship is available for the light propagation through biological tissues:

5.3 The following empirical rclationship is available for the light propagation through biological tissues A-1 A+1 1.440+ 0.710 +0.688 +0.0636 where A is the internal reflectance factor for a tissue, and nyel is the ratio of the refractive indices of the tissue and the medium. When nyel equals 1, A reduces to unity. Find the value of nrel in order to give a reflectance factor of 4.0