A flashlight on the bottom of a 4.10 m deep swimming pool sends a ray upward and at an angle so that the ray strikes the surface of the water 2.25 m from the point directly above the flashlight. What angle (in air) does the emerging ray make with the water's surface? I attempted to find the angle of incidence by using the lengths given and the arc tangent function and then to plug it into Snell's Law (n1sinθ1 = n2sinθ2). For the angle, I got 61.2 degrees by doing "inverse tan(4.10/2.25)." However, when solving Snell's Law for θ2 and plugging in all of the values, the calculator keeps saying "domain error." I'm plugging in... "inverse sin((n1sin61.2)/1.00) and I keep getting the error message. Please help!