a. A signal is transmitted by a violet laser beam in a 4000 km long crown glass optical fiberfrom Hawaii to California. How much time is required for the signal transmission?

b. An initially unpolarized beam with intensity lo is passed through a polarizing filter with-axis at 0 = 0º. The beam is then passed through 3 additional polarizing filters with axis at0 = 30°, 0 = 60°, and € = 90° in that order. Calculate the final intensity of the beam?c. Does the order of the polarizing filters in part b actually matter? Give reasons.