Answer:
4. optics
Step-by-step explanation:
If a person was interested in studying how light passes through clear substances, the field of science which would be the best course of study is optics. Optics refers to the field of science which typically deals with the study of light and infrared radiation, as well as their interaction with substances or objects (matter).
This field of science (optics) makes it possible for scientists and researchers to observe the propagation of light from a source through a medium, understand the behavioral patterns and properties of light.