Light propagating in the glass n1 = 1.65 wall of an aquarium tank strikes the interior edge of the wall with incidence angle 19.0 degrees. What is the angle of refraction in the water?

We can solve this using Snell's Law which is represented by the equation:

sin θ₁ / sin θ₂ = n₂ / n₁

From the problem, we can substitute values and solve for the angle of refraction.

sin 19 / sin θ₂ = 1.65 / 1

θ₂ = 11.38°

The angle of refraction would be 11.38°.