Keeping Eq. (8.29) in mind, write an expression for the randomly polarized flux density co...

Keeping Eq. (8.29) in mind, write an expression for the randomly polarized flux density component (In) of a partially polarized beam in terms of the Stokes parameters. To check your result, add a randomly polarized Stokes vector of flux density 4 to an .  of flux density 1. Then see if you get In = 4 for the resultant wave.