How to make a Magnifying Glass

Playing detective is one of my little ones favourite games, but to be a real detective involves lots of Science! So today we’re going to make a magnifying glass.

How to make a Magnifying Glass


A clear plastic bottle

A dry marker pen

A pair of scissors


How to make your own magnifying glass, Science Sparks

How to make…

1. Draw a circle shape at the neck of the bottle. It needs to be here so you create a disc shape when you cut it out.

How to make a Magnifying Glass, Science-Sparks

2. Cut out the circle

3. Pour a little water into the disc.

How to make a Magnifying Glass, Science-Sparks

4. Hold it over your book or paper to make the letters bigger. It really works so well!

How to make a Magnifying Glass, Science-Sparks

The science bit.

The disc shape you have cut out curves outwards, so is a convex shape. By adding the water the light that passes through is refracted meaning that it is bent inwards, creating a lens effect and enlarging the size of the letters. So you have then created your very own magnifying glass!

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There are 24 comments

  1. Carrie

    Oh, how neat!! My daughter would love this. We will definitely have to give it a try. Thank you for sharing at Sharing Saturday!! I hope you are having an amazing week!

    Oh, and on another note, have you seen the latest issue of Family Fun Magazine? They have a craft/activity very similar to your lung one. I thought of you when I saw it.

  2. A Brief History – Site Title

    […] It was not long after my dive into the world of orb weavers that I started taking an even deeper interest in all spiders. I started making a point of capturing them for short periods of time to identify and learn about them. The next notable spider I remember catching was a yellow sac spider. It was quite small so I made a “magnifying glass” out of a plastic bottle and some water. […]

  3. Private Eye – Sparking Children's Thinkibility

    […] Magnifying glasses can reveal fascinating things. Compare what your eye can see with a magnifying glass and what it cannot see without it. Draw objects such as coins and a toy without the magnifying glass. Then use the magnifying glass and draw the objects from far away and very close. Compare the different drawings. You can also make a magnifying glass by using water. […]

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