Pandai Lab 3: Refraction Experiment

Have you tried any refraction experiments at home or school? Here, Pandai Lab 3 brings you to learn the refraction concept and at the same time you play a magic trick! Sounds cool, right? This special experiment using zip lock bags only and check on the magic trick happened!

On 22 October 2020, Thursday, we will make a refraction experiment using simple materials. This Zip Lock Bag Water Refraction is good to try. Just draw anything you want, then a picture will disappear in water. Here the details:

Date: 22 October 2020

Title: Refraction Experiment

Materials: zip lock bags, markers, A4 papers & a jug filled with water.


1. First, we cut A4 paper into the appropriate size, just to fit the size of the ziplock bag

2. Use the marker to draw your hand and any bacterias on the paper, then put the A4 paper into the ziplock bag and then seal it.

3. Repeat the hand part to draw on the ziplock only. 

4. Put the picture in the jug that is filled with water from the top. This is critical. You have to look in the same direction from the top to get this trick to work.  

5. When you look at the picture from the top, the bacteria you draw on the paper will disappear and you will only see the hand you draw on the zip lock bag. 

6. When the zip lock bag is taken out of the water, the bacteria will appear again.

What makes this possible and happened?

This experiment is all about the refraction. Make sure you look from the top and the ziplock bag should be placed as vertically as possible. In general, total internal reflection takes place at the boundary between two transparent media when a ray of light in a medium of higher index of refraction approaches the other medium at an angle of incidence greater than the critical angle. When we look at the water from the top of the beaker the total reflection will occur and the light from the drawing on the paper will not enter our eyes, so the part written on the paper in the ziplock bag cannot be seen while the part written on the ziplock bag is not totally refracted so you can still see it. When we lifted the ziplock bag out of the water we could see two parts.

You can check the reference on this link for more details:

Check out this video Live Pandai Lab 3 for you:

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