2. Nature and Propagation of Light (576-586) 576.Problem 42.7 (RHK) 577.Problem 42.9 (RHK) 578.Problem 42.13 (RHK) 579.Problem 42.20 (RHK) 580.Problem 42.19 (RHK) 581.Problem 42.15 (RHK) 582.Problem 42.25 (RHK) 583.Problem 42.27 (RHK) 584.Problem 42.23 (RHK) 585.Problem 42.24 (RHK) 586.Problem 42.28 (RHK)