Which of the following describes an opaque material?

An opaque material is one that completely blocks light from passing through it. This means that when light encounters an opaque substance, it cannot penetrate or become visible on the other side. Examples of opaque materials include wood, metal, and stone. These materials may absorb or reflect light, but they do not allow any light to transmit through them.

Understanding opaqueness is important in everyday applications, such as in building materials, clothing, and packaging, where the need for light blockage is crucial. The other options describe characteristics of transparent and translucent materials; for instance, transparent materials allow light to pass through clearly, while translucent materials let some light through but scatter it in various directions.