Angle of Refraction: Find Low Power Laser Incident Angle

[05holtel]

Homework Statement

A low power laser is incident at the interface between crown glass (n=1.52), and air at an angle of 45 degrees. The refracted ray into air makes an angle with respect to the normal of the surface that is closest to ...
Question 2 answers
27.7 degrees
41.1 degrees
45.0 degrees
62.3 degrees
There is no refracted ray due to Total Internal Reflection

The Attempt at a Solution

I am trying to use n1sinx1 = n2sinx2 but i keep getting an error in my calculator

 

[rl.bhat]

Find the critical angle for crown glass using the formula sinC = 1/n1.
If the angle of incidence is less that the critical angle use your formula to find the angle of refraction. Other wise...?