Diffusion scatters light making the source broader and softer. For example, when clouds drift in front of the sun, shadows get less distinct. For the shadows to disappear, just add fog.
Thirdly, bouncing light acts as diffusion. By aiming a narrow source of light at a broad matte surface such as wall and ceiling, it will not only reflect the light but will also diffuse it by scattering it over a wider area. The further the light source, the more it falls off meaning it gets dimmer on your subject. If light is moved twice as far from the subject you end up with only one quarter of it on the subject. Light fall-off can be used for varying the relationship between the light on your subject and your background. If a light source is placed close to the subject, the fall-off from the subject to the background will be more pronounced. When light is moved further from the subject, the background will be relatively brighter.
Generally, I have learnt a lot from the light photography assignment. Light lessens shadows, the closer the source of light the closer the light, diffusion scatters light, and that bouncing light acts as diffusion. The further the light source, the more it falls off, Light falloff can be used to vary relationship and Front lighting deemphasizes