1. An apparatus, comprising: a light beam scanning device configured to scan a light beam, within a scan range, over a scene that is within a field of view of the scan range and generate an image map of at least a portion of the scene, based at least in part upon a time of flight of the light beam to and from one or more points within the scene, wherein the device comprises: a lens element assembly configured to dynamically adjust a divergence of the light beam, such that a spot size of the light beam is adjusted.