#1

In the figure, light strikes the surface of a liquid at the
Brewster angle, and the reflected light is 100% polarized. Suppose
the light originates in air and the angle of refraction in the
figure is θ₂ = 30.4°. Find the value of the
index of refraction n₂ of the liquid.

_______

#2

A point source of light is submerged 2.2 m below the surface of
a lake and emits rays in all directions. On the surface of the
lake, directly above the source, the area illuminated is a circle.
What is the maximum radius that this circle could have?
______ m