human
Question: While conducting an investigation on refraction, a teacher uses a red laser pointer to show how a beam of light is affected as it passes through several glass objects. The teacher should make sure that the

Choices:
A) room is totally dark.
B) light source is ultraviolet.
C) beam of light does not travel toward the students.
D) room walls are shielded with insulating material.
gpt
The correct answer is 2: beam of light does not travel toward the students..