Persistence Vision (61 Brilliant Biology Experiments)

You will need:

1. Long wooden ruler
2. Projector
3. Movable white screen or large sheet of chart paper
4. Computer

Understand persistence of vision through this experiment.

INSTRUCTIONS

1. Request your teacher at the school to help assist you with a projector. Place a white screen 8 feet away from the projector.
2. Position your screen in front of a door or window so that when it is removed the image from the projector may no longer be visible.
3. Using a computer, reflect any image onto the white screen or chart paper that is placed in front of the window/door.
4. After you have seen the image reflect on the screen, remove it.
5. The image displayed from the projector will no longer be visible.
6. Take your ruler and move it vertically up to down in quick movements, in front of the projector, in the place where the screen had been.
7. Move it in quick successions till the image from the projector is visible.

RESULT

The reason we can see the image on a moving ruler is because the image gets reflected back to our eyes in the form of narrow slices. Since our eyes can remember an image for 1/30 of a second after the image has disappeared, the individual strips of light reflecting the image form a continuous image. This is known as persistence of vision.