How do you find the difference in the angle of refraction

Sunlight strikes a piece of crown glass at an angle of incidence of 36.7 degrees. Calculate the difference in the angle of refraction between a orange (610. nm) and a violet (410. nm) ray within the glass. The indices of refraction for the orange and the violet are n = 1.522 and n = 1.538, respectively.

I'm very confused. Can someone help me?

n1 sin(theta 1) = n2 sin (theta 2)
1.522/1.538 sin(36.7) = arc sin(theta 2)
sin(theta 2) = 36.25
angle diff= 0.45