Final answer:
An embrasure may diverge in directions away from the axis of a diverging lens or mirror, such as when light rays enter the lens parallel to the axis or when hitting a convex mirror.
Step-by-step explanation:
An embrasure in an optics context refers to the path or spread of light as it encounters lenses or mirrors. Specifically, when discussing diverging lenses or mirrors, such as a convex mirror or a concave lens, rays of light can diverge, or spread out, in various directions. For instance, a ray entering a diverging lens parallel to its axis seems to emerge from the focal point on the same side of the lens, indicating divergence. Similarly, light rays that strike a convex mirror parallel to its axis bend away from the axis, again showing divergence. In all these cases, the direction of divergence is away from the axis of the lens or mirror.