6 [4] An antireflection coating for light at normal incidence is to be applied to the visor or a racecar driver's helmut for the Monaco GrandPrix. The visor has an index of refraction of n=1.38. The thin coating to be applied has lower index of refraction of n=1.18. Determine the optimal coating thickness on the outside surface of the visor. 6b) [4] A second upgraded visor with a polarizing layer is made. This is to reduce the glare from reflected light from wet roads in the case there is rain. Consider the reflection from the wet road (nH20=1.33). Assuming the sun is straight up at noon and there are 6 hours from noon to sunset, at what time in the afternoon (which determines the angle of incidence of the sunlight) will this polarizing visor be most useful in blocking the reflection from the road