I will be happy to critique your calcs.
Use Snell's Law.
1.A light ray enters from air (n1 = 1.0) onto glass (n2 = 1.5). Calculate Θ2 (transmission angle) values for Θ1 (incident angle) values 10, 20, 30, 40, 50, 60, 70, 80 degrees, respectively.
2 answers
sini÷sinr=nr÷ni