A swimmer underneath the water (n = 1.33) looks up to the surface and watches th

Question

A swimmer underneath the water (n = 1.33) looks up to the surface and watches the sun set. The sun begins very high in the sky and eventually falls below the horizon of the lake.

1. At some time before the sun gets to the horizon, light from the sun that is reflected off the lake is completely polarized. At what angle does the sun appear to the swimmer at that moment?

= 53.06 degrees

2. Just as the sun gets to the horizon, at what angle does the sun appear to the swimmer?

= ???

Got 36.94 for this question but it appears to be wrong.

Explanation / Answer

2) take a ray from water to air,

Apply snell's law

sin(theta_i)/sin(theta_r) = n2/n1

sin(theta_i)/sin(90) = 1/1.33

theta_i = sin^-1(1/1.33)

= 48.75 degrees <<<<<<-------------Answer

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