Final answer:
Complementary materials are composites made from combining different substances, resulting in unique properties, while constant materials are pure substances that maintain the same properties throughout. Materials influence design decisions, and for items like light meters, choosing the right material is crucial for functionality.
Step-by-step explanation:
Complementary materials are composite materials that consist of two or more different components, which when combined, produce characteristics distinct from the individual ingredients. These composites are often used in construction and manufacturing due to their enhanced properties. For example, fiberglass, a composite material, is created by reinforcing plastic with glass fibers, resulting in a material that is strong but lightweight.
On the other hand, a constant material is referred to as a pure substance, which maintains consistent properties and composition throughout. Pure substances include elements, like aluminum, and compounds, such as water. These materials are not blended with others and therefore retain a fixed set of characteristics.
The use of a material greatly affects the design and functionality of an item. In the case of textiles, the pattern can play a crucial role in the look and utility of the finished product. For example, the material and pattern used in a light meter must minimize reflections and interference to provide accurate measurements.