लीनियर या सर्कुलर – पल्फ्रिच इफ़ेक्ट पेंडुलम डेमो

A pendulum and filter experiment that shows an amazing illusion: a pendulum swinging in one plane appears to move in an ellipse when you look at it with a neutral density filter in front of one eye.

What it shows

• This effect was first noticed by Pulfrich, and it is called the Pulfrich effect
• It is caused by the way the eye and brain perceive things
• A neutral density filter in front of one eye distorts the perception of depth, size, velocity and position

Perfect for

Physics and perception demonstrations in schools and science exhibitions.