1) An un polarized beam of light is incident on an air/glass interface

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1) An un polarized beam of light is incident on an air/glass interface.  The glass has an index of refraction of 1.5. What fraction of the incident power is reflected when the angle of incidence is zero?  Express your answer as a percentage with two significant digits.

2) For the previous problem, what fraction of this reflected power would be blocked by ideal polarized sunglasses? Ideal here means the sunglasses completely block one polarization and completely pass (with no loss) the orthogonal polarization.  Express your answer as a percentage with two significant digits.