A beam of light in air enters a glass block at an angle of 30° to the glass surface, as sh...

A beam of light in air enters a glass block at an angle of 30° to the glass surface, as shown. The glass has an index of refraction of 1.35. (a) Find the angle labeled θ1. (b) Calculate the critical angle between the glass and air. (c) Does the light follow path A, path B, or both? Explain. (d) Find the angle(s) θA, if light follows path A, and θB, if light follows path B.