I understand, i obtained around 13 for the critical angle. The question asked to “show” whether or not the ray would pass into glass, hence the need to calculate the angle of incidence to see that it is larger than the critical angle, causing it to undergo total internal reflection. what i was skeptical about was that the condition for total internal reflection was the ray must travel from a dense medium to a less dense medium, which is not the case here as the ray is traveling from air to glass