1. The problem statement, all variables and given/known data The problem asks: The index of refraction for violet light in silica flint glass is 1.66, and the index of refraction for red light is 1.62. What is the angular spread of visible light passing through a prism of apex angle 60 degrees if the angle of incidence is 50.03 degrees? 2. Relevant equations n1=1.62 n2=1.66 n =1 theta1=50.03 Angular spread= arcsin[n*sin(theta1)/n1] - arcsin[n*sin(theta1)/n2] 3. The attempt at a solution I plugged in my numbers into the equation above and got: Angular spread= arcsin[1*sin(50.03)/1.62] - arcsin[1*sin(50.03)/1.66] and got: 0.7388 but that was wrong...so where did I go wrong?