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**1. Homework Statement**

A beam of light in air strikes a piece of glass (n=1.51) and is partially reflected and partially refracted. Find the angle of incidence if the angle of reflection is twice the angle of refraction.

**2. Homework Equations**

n1sintheta1 = n2sintheta2

**3. The Attempt at a Solution**

The angle of reflection equals the angle of incidence, which is twice the angle of refraction.

Therefore, I set up the equation as:

1 * sin (2theta) = 1.51 * sin (theta)

But when I try to solve for theta I get that they cancel out (sin 2theta / sin theta) just equals 2? I think I'm doing the trig wrong but I don't know why?