Enter the desired input parameters and press the "Calculate" button. If you have a slow computer, it may take 15 seconds or so to return. The image is in 8-bit grey levels which is a limitation not only in JAVA but also sometimes experimentally if 8-bit cameras are used to measure the image. If the image is completely black, or just too dark, you need to increase the light level. On the other hand if you see nothing or the image is too light you can reduce it.

First try experimenting with the pinhole diameter. As you make the pinhole bigger the image gets brighter but much blurrier. On the other hand when you make it smaller the image gets sharper, but dimmer. It is important to realize that diffraction is not included in the model here. In the real world for some pinhole sizes diffraction is an important effect and would lead to additional smearing of the image.

Next try changing the object and image distances. Note that these also affect the brightness and sharpness of the image. In addition, they affect the size of the image. You can use the bar on the duck's neck to measure the magnification.