Question
A laser is fired from a submarine beneath the surface of a lake (n = 1.33). The laser emerges from the lake into air with an angle of refraction of $67^\circ$. How fast is the light moving through the water? What is the angle of incidence of the laser light when it crosses the boundary between the lake and the air?
$v = 2.26 \times 10^8 \textrm{ m/s}$
$\theta_1 = 44^\circ$
Solution Video