A Simple water drop as natural lens to magnify objects

A Simple drop of Water can function as a natural lens to magnify objects.

A drop of water acts as a natural lens because its curved surface bends light rays, making objects appear larger: 

Why

  1. Shape

The surface tension of water causes the molecules to form a rounded, convex shape.

  1. Light bending

The convex curvature of the water drop bends light rays inward, creating an enlarged image on the retina of your eye.

  1. Magnification

The smaller the droplet, the more magnification, but it's also harder to focus.

  1. Distortion

If the water drop moves or changes shape, the image will be distorted.


The principle of water droplets as lenses was used in early microscopes, such as those used by Anton van Leeuwenhoek 

(1632-1723). He perfected these early microscopes by using carefully prepared glass beads, similar in shape to your water droplet. Although difficult to use, these microscopes were powerful, able to magnify up to 200x.


Experiment

To try this experiment, you will need:

- water

- a piece of clear plastic

- a flashlight

You can use just about any piece of clear plastic. I I also tried a section cut from a plastic storage bag and it worked well too. Whatever you are using, you need a piece that is at least a couple of inches square. It need to be large enough for you to hold easily when you are looking through it.

In the center of the piece of plastic, put a large drop of water. This water drop will be the lens for our magnifier. Now we need something to look at. First try something easy, such as a piece of newspaper. Hold the plastic with the water drop about an inch above the paper. Look at the text through the water drop. It should look larger. By moving the water drop up and down, you can change how much you magnify the type. Experiment with larger and smaller drops to find the size that works best.

 Once you have seen that, try looking at some other things. Compare grains of salt and grains of sugar. Can you see a difference? Look at your fingertip, noticing the ridges that make up your fingerprint. 

Compiled by

Ms Naresh kuwar

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