(b) Laser light goes through air and enters a crown glass tube. The way of the laser in air isn't visible, yet the glass disperses enough light to decide the way of the light in the cylinder. The angle between the light and the outside of the cylinder where the light enters is seen as 64° inside the glass. What was the angle between the light and the surface of the tube in the air outside the tube? urgently needed

(b) Laser light goes through air and enters a crown glass tube. The way of the laser in air isn't visible, yet the glass disperses enough light to decide the way of the light in the cylinder. The angle between the light and the outside of the cylinder where the light enters is seen as 64° inside the glass. What was the angle between the light and the surface of the tube in the air outside the tube? urgently needed