As the point of focus approaches infinity, what happens to the depth of field?

As the point of focus approaches infinity, the depth of field increases. This phenomenon occurs due to the geometry of light and the way lenses work. When you focus on distant objects, more of the scene in front of and behind the point of focus will appear sharp to the viewer, effectively increasing the depth of field. This is particularly important in various fields such as photography and cinematography, where capturing more elements in focus can significantly impact the composition and storytelling.

As the focus distance increases, the degree of blur for objects that lie outside the depth of field also diminishes. This allows a broader range of distances from the camera to remain in acceptable focus, hence enhancing the depth of field.

In contrast, choices implying a shallower depth of field or that it remains the same do not account for the optical principles at play. The choice suggesting that it becomes wider but less sharp is misleading because while the depth of field indeed widens, it doesn't inherently result in less sharpness; rather, more of the scene remains in focus.