A control device includes an image-formation command section and a first reception section. The image-formation command section commands an image forming section to form multiple latent images based on one input image onto an image bearing member in accordance with different light emission patterns by using a light source including multiple light emitting members, develop the latent images, and output the multiple developed images to a medium. The first reception section receives a designation by a user with respect to one of the multiple light emission patterns after the multiple images are output. Each light emission pattern indicates which of the multiple light emitting members included in the light source is to emit light.

A light scanning apparatus includes a light source, a deflector configured to deflect a light flux from the light source, and an imaging optical system configured to guide the light flux deflected at the deflector onto a scanned surface. The imaging optical system consists of a single imaging optical element, wherein, on the optical axis of the imaging optical system, the conditions 0.15T2/Sk0.3 and 0.03d/K0.08 are satisfied. A condition 0.3B0.6 is satisfied at a condensing position Y where a scanning angle is greatest, when the condensing position Y in the main scanning direction on the scanned surface of the light flux deflected at the scanning angle by the deflector is expressed by Y=(K/B)tan(B).