The figure below shows a light ray traveling in a slab of sodium chloride surrounded by air. The ray is incident on the right surface at an angle of 55° with the normal and then reflects from points A, B, and C. (Select all that apply.) A ray travels within a rectangular slab that is surrounded by air. The ray starts at the top of the slab and is incident on the right side of the slab at point A, and makes an angle of 55° to the normal. The ray reflects internally down and to the left and is incident on the bottom of the slab at point B, whereupon it reflects internally up and to the left until it is incident on the left side of the slab at point C, where it again reflects internally, up and to the right. (a) At which of these points does part of the ray enter the air? (Select all that apply.) A B C (b) If the sodium chloride slab is surrounded by diamond, at which point does part of the ray enter the diamond? (Select all that apply.) A B C

The figure below shows a light ray traveling in a slab of sodium chloride surrounded by air. The ray is incident on the right surface at an angle of 55° with the normal and then reflects from points A, B, and C. (Select all that apply.) A ray travels within a rectangular slab that is surrounded by air. The ray starts at the top of the slab and is incident on the right side of the slab at point A, and makes an angle of 55° to the normal. The ray reflects internally down and to the left and is incident on the bottom of the slab at point B, whereupon it reflects internally up and to the left until it is incident on the left side of the slab at point C, where it again reflects internally, up and to the right. (a) At which of these points does part of the ray enter the air? (Select all that apply.) A B C (b) If the sodium chloride slab is surrounded by diamond, at which point does part of the ray enter the diamond? (Select all that apply.) A B C