Light is incident on a water surface at such an angle that the reflected light is complete...

Light is incident on a water surface at such an angle that the reflected light is completely linearly polarized.

a. What is the angle of incidence?

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b. The light refracted into the water is intercepted by the top flat surface of a block of glass with index of 1.50. The light reflected from the glass is completely linearly polarized. What is the angle between the glass and water surfaces?

Figure 1.