Q: Fact 1: Aprism is used for refracting light. Fact 2: Refraction is the bending of light cause by a speed change when it passes through different media. Given the two facts above, what aspect of light changes when it passes from air into a prism?

Select from the following.
[1]. power;
[2]. seasons;
[3]. speed;
[4]. energy;
[5]. a wave;
[6]. Joules;
[7]. heat;
[8]. unique;
A:
[3].