Final answer:
Shafts of light falling at odd angles and colors in light used arbitrarily are examples of dispersion and chromatic aberration in light, which are part of the study of wave optics in physics.
Step-by-step explanation:
The examples given, such as shafts of light falling at odd angles and colors in light used arbitrarily, are related to the dispersion of light and the phenomenon known as chromatic aberration.
When light passes through a medium like a prism, different colors are bent by different amounts due to their different wavelengths, resulting in a separation of colors. This is called dispersion. Similarly, when light is reflected or refracted by a curved surface, different colors have different focal points, causing them to focus at different locations. This is known as chromatic aberration.
These phenomena are part of the study of wave optics in physics.