A STEM Project: Camera Obscura - A Pinhole Camera

This camera obscura allows light to go through a small 1 mm pinhole opening. The light is projected on the other side of the box on a piece of vellum. The projected image is upside down. Four boxes of 65 lb. black cardstock of varying depths...1, 1 1/2, 2 and 2 1/2 inches with a pinhole are to be made.  The lid of the box is made out of vellum.

Here is the PDF.  

https://drive.google.com/file/d/1ag45PhYrDrGv7pxKymOwvoGWY8J0RR4N/view?usp=sharing

Here is the .Studio file.

https://drive.google.com/file/d/1Fhy9jsMPZKHMMN1FmOLypba6zRqexRDI/view?usp=sharing

Please check to see if the pinhole is cut properly. There might be a hanging chad that needs to be removed by poking it with a pin.  All of the pinholes are the same size in each of the boxes.

 I used a six LED bulb clip-on light as the light source.  I colored two small squares of plastic wrap.  Each plastic square covered two of the six LED bulbs.  I used a dark pink and blue permanent marker.  I did try other colors but they were too faint.  I taped the blue square to the upper portion of the light and the pink square to the lower portion of the light.  I left the middle two LED bulbs clear.

Place the boxes in a straight line and a ruler parallel to the boxes as shown above. Moving the light so that it is parallel to the largest box, I observed that the image that is portrayed in the velum has the colors reversed.  I continued to do the same for the remaining boxes. Images shown below.

2 1/2 inch depth

2 inch depth

 1 1/2 inch depth

1 inch depth

Conclusion: 

If the distance between the pinhole and velum is reduced, the size of the image will decrease and the image will become brighter since the light spreads over a small area. If the distance between the pinhole and velum is increased, the image size will increase and the image however will get less bright since the light spreads over a large area. There were six LED bulbs in the lamp.  Only four lights were clearly visible, the other two lights were faint as they were out of range.