Increasing the focal length of a camera _____ pixel density.

Increasing the focal length of a camera increases the pixel density. This is because a longer focal length allows the camera to capture a narrower field of view but with more detail from a specific area at a distance. When the camera lens has a longer focal length, the images produced will be larger and can result in more pixels being concentrated on the details within the frame, thus enhancing the overall pixel density.

This effect is particularly important in surveillance applications where identifying specific features or details in the image is critical. Higher pixel density translates into better resolution, allowing for clearer images that can be used for identification or analysis.

In contrast, reducing the focal length would capture a wider field of view but could potentially decrease the level of detail on subjects at a distance, negatively impacting pixel density for those particular subjects. Other options imply that the effect of focal length does not contribute to pixel density or only affects clarity, which does not adequately address the relationship between focal length and pixel density.