An orifice darkroom is a completely closed object, with opaque walls and a small hole on one side. By placing a small luminous or illuminated object in front of the camera, we can observe the image formed on the wall opposite the hole. This image is a real and inverted image.
The human eye behaves like an orifice darkroom, where light enters through the iris, and the central orifice is the pupil. Upon penetrating the pupil, light reaches the opposite region called the retina, where the image is formed. This image, just like in the darkroom, is inverted.
In the darkroom, the smaller the hole, the sharper the image formed by the camera.
The construction of an orifice chamber is quite simple. You will need:
1 can of powdered milk
1 piece of tracing paper
1 scissors
1 nail
1 hammer
1 all paper glue
1 candle
Make a hole with the nail in the bottom of the can.
Cut out the parchment paper with a diameter approximately 1 cm larger than the diameter of the can opening.
Glue the tracing paper to the opening (in place of the lid). Your Orifice Darkroom is ready.
In a dark room, light the candle and position your chamber, with the hole facing the candle, and see the result.
Remember to use a very thin nail to pierce the can. This way the image formed by the camera will be sharper.
By Kleber Cavalcante
Graduated in Physics
Brazil School Team
Optics - Physics - Brazil School
Source: Brazil School - https://brasilescola.uol.com.br/fisica/construcao-uma-camara-escura-orificio.htm