Pulfrich Effect | Kannada
Channel: Arvind Gupta
Date: 2017-04-11

Hi! My name is Rick Hall. I am the founder of a company called IGNITE, based in Nottingham, England. We try to get more creativity in science lessons in schools. I am in the wonderful garden of the IUCAA Science Center in Pune, India. I am going to show you some simple experiments. A lot of experiments we do are about our senses – and how the brain interprets what we see, hear or touch. I will show you an experiment called the Pulfrich Effect. For this I need some cheap sunglasses. These sunglasses have a particular feature – they have a lens missing. So, I went to the market and I bought some very-very cheap sunglasses. It’s quite tricky and you might need some help to remove one lens. You should be able to push out one of the lenses from the sunglasses. This one eyed sunglasses is the perfect equipment for the Pulfrich Effect. The other thing you need is some kind of a pendulum. I just made mine out a curtain ring and a piece of string.
Hope you have noticed that there is something strange about the glasses. One of the lenses is missing. First take the glasses off and watch this piece of string swinging. It’s a simple pendulum. I promise that I’m not trying to hypnotize or make you go to sleep. Please see that the pendulum is swinging from side to side. Now put your glasses on. Now look at the pendulum again and tell me what you see. Well you will see that the pendulum now swings in a circle. The pendulum will now go around in a circle.
I will keep swinging the pendulum from side to side as before. But this time I want you to put the glasses upside down. Now you will see that the pendulum swings in a circle but actually moves in the opposite direction. Now you will see that the pendulum is going around my fingers. Take your glasses off, and you will see that I haven’t done anything but swung the pendulum from side to side.

This work is supported by IUCAA (www.iucaa.in) and TATA Trust (http://www.tatatrusts.org/) and (www.tata.com/aboutus/sub_index/Tata-trusts)

TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to the underprivileged population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA's Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit www.tatatrusts.org

Credits:,Ashok Rupner, Pradnya Pujari, Shivaji Mane, Jyoti Hiremath, Arvind Gupta

Dubbed in Kannada by P K Nanawaty