Camera Obscura – Magic
It was my second time to visit the Camera Obscura, located at the Royal Observatory in Greenwich, South London.
The first time we went which was the autumn of 2013, Peter excitedly insisted that we enter into this building complete with a doorway shrouded in black curtains. Inside was pitch black, as dark as the night.
In the middle of this fairly tiny room, probably 4square metres (only 6-8 people allowed in at any given time), was a polish table which looked to me like a white marble. We all looked at the table and thought there was nothing really special about it. Just an empty table. We went out of the room absolutely perplexed and disappointed, the same look and feeling on the other faces that had also went in and out with us. We were all asking? What was that about?!!!
Yesterday was a glorious warm and sunny day. While at Greenwich Royal Observatory, Peter, Stacey, Nathan and I went into the black shrouded doorway and on the table was a real time panoramic projection of an image of Greenwich. People can be seen moving on the projected image. Finally we understood what this camera obscura was about! 🙂 🙂 🙂
Camera obscura (from Latin words: camera, meaning room and obscura, meaning dark) uses a natural optical phenomenon projected from a small hole, a pinhole. This has something to do with physical law that light travels in straight line. When some of the rays reflected from a bright subject pass through a pinhole, the rays do not scatter but reform to reflect an upside down image of the subject the rays were reflected from. I wish now that I had paid attention to physics class! 🙂
The Greenwich camera obscura uses lens for a larger image projection.