In an experiment to measure the index of refraction of human skin, it was found that if a beam of unpolarixed light was shone on a skin sample from air at an incident angle of 54.7 degrees, the reflected light was completely polarized. What is the index of refraction of this skin sample?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.