This image demonstrates how a concave lens refracts (bends) light causing the three distinct rays of light to diverge from one another. The lens was placed on a piece of white matte board. A single strobe was placed inside an opaque box to the left. Three perfectly aligned pin holes were made in the box and inside the box over each hole, a written filter was placed (one red 25, one green 58, one blue 47B). The light was adjusted to skim across the surface of the matte board, pass through the lens and continue to skim the surface of the matte board upon exiting the lens. These adjustments plus camera positioning, framing and focusing were done in a lit studio then the lights were turned out and the exposure was made allowing the white matte board to appear black except for the three colored bands of light. Nikon F, AI Nikkor 55mm f/2.8 Macro Lens, Ektachrome 200.