Answer:
[tex]\theta_2 = 15.8[/tex]degree
Explanation:
given data:
[tex]\theta_1 = 28.7 degree[/tex]
accoding to the snell's law
[tex]n_1*sin\theta_1=n_2*sin\theta_2[/tex]
where n1 is refracting index of air = 1
n2 is refracting index of glass = 1.55
putting all value to get angle mad by incident ray with normal
[tex]\theta_2 = \frac{1*sin28.7^{o}}{1.55}[/tex]
[tex]\theta_2 = 15.8[/tex]degree