Which department is primarily involved in bouncing light on a film set?

The grip department plays a crucial role in bouncing light on a film set. Grips are responsible for setting up, managing, and adjusting equipment that supports the lighting. This includes the use of reflectors, flags, and diffusers, which help manipulate light effectively to achieve the desired look of a scene. The grip's expertise in handling these tools allows for the control of light angles, intensity, and quality, enhancing the cinematographer's vision.

While the electrical department does work with lighting fixtures and the power needed to run them, they focus primarily on the electrical components necessary for the lighting setup and maintaining the safety of the power supply. The cinematography department involves the overall visual look of the film and works closely with both grips and electrical teams, but they don't directly handle the physical setup of lighting equipment in terms of placement and adjustment. Production design focuses more on the aesthetic aspect of the set and props rather than the technical aspects of lighting. Thus, the grip department is specifically designated for tasks related to light manipulation, making it the correct choice.