• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
Menu
  • Science Experiments For Kids
  • Science Fair Projects
  • Science Facts
  • Science Questions
  • About
    • Emma Vanstone
    • About Science Sparks
Science Experiments for Kids
Menu
  • STEM Challenges
    • STEM Challenges
    • FREE STEM Challenge Templates
  • Early Years Science
    • Preschool Science
    • Sensory and Messy Play
    • Understanding of the World
    • Pirate Science Experiments
  • Primary Science
    • Baking Soda Experiments
    • Candy Experiments
    • Biology
    • Climate Change for Kids
    • Coding for Kids
    • Chemistry
    • Electricity for Kids
    • Magic Science Experiments
    • Harry Potter Experiments
    • Human Body Science
    • Air Pressure Experiments
    • Life Cycles
    • LEGO Science Experiments
    • Kitchen Science
    • Famous Scientists
    • Forces and Motion
    • Science Sparks Snippets
    • Key Stage 1 Science
      • Animals
      • Everyday Materials
      • Plants
      • Coding Activities
      • Humans and Health
      • Fine Motor skills
      • Science and Literacy
    • Key Stage 2 Science
      • Animals, Including Humans
      • Electricity
      • Light
      • Plants
      • Materials and their Properties
  • Holiday Science
    • Christmas Science
    • Halloween Science
    • Easter Science
  • Storybook Themed Science Experiments
  • Wonderful Women in STEM
  • FREE Science Resources
menu icon
go to homepage
search icon
Homepage link
  • FREE Experiments
  • Science for Kids
    • Kitchen Science
    • Climate Change
    • Egg Experiments
    • Fairy Tale Science
    • Edible Science
    • Human Health
    • Chemistry
    • Inspirational Women
    • Forces and Motion
  • Science Fair Projects
  • STEM Challenges
  • Science Sparks Books
  • Contact Science Sparks
  • Science Resources for Home and School

×
Home » Key Stage 2 Science » Disappearing Coin Trick – Refraction Demonstration

Disappearing Coin Trick – Refraction Demonstration

Modified: Oct 2, 2024 · Published: Feb 28, 2018 by Emma Vanstone · This post may contain affiliate links · Leave a Comment

Here at Science Sparks, we love science tricks and super simple science experiments. This disappearing coin trick is both!

The trick uses refraction of light to make it look like a coin under a glass disappears!

Impress your family and friends with this simple science magic trick and learn about light at the same time!

How to make a coin disappear

Materials

Glass cup or jar

Coin

Water

Empty glasses and coins for a science magic trick using refraction

Instructions

Place a glass on top of a coin and ask a friend if they can still see the coin. Hopefully, they will say yes!

Pour water into the glass and ask your friend if they can see the coin now. They should say that the coin has disappeared.

empty glass of water for a refraction of light experiment.

Why does the coin disappear?

Light (from the sun or artificial light) travels in a straight line, bounces off objects, and enters our eyes, allowing us to see things. Generally, there is little or no refraction of light as it travels through air.

However, when you pour water into the glass or jar, the light from the coin is refracted ( bends ) and doesn’t reach your eyes, which is why the coin seems to disappear.

Did you know that the retina at the back of your eye contains over 120 million rods and 8 million cones?? Rods detect light and dark, and cones allow us to detect colour.

More light experiments and investigations

Try a light refraction experiment with arrows.

Make a light maze to demonstrate light travelling in straight lines!

Split light into the colours of the rainbow with a prism!

prism on a window sill splitting light into it's constituent colours

Suitable for Key stage 2 Science

Light

Light travels in straight lines

Scientific concepts

Light

Refraction

Image of coins and a glass for a science magic trick using refraction to make a coin disappear

Last Updated on October 2, 2024 by Emma Vanstone

More Key Stage 2 Science

  • Edible Butterfly Life cycle
    Edible Butterfly Life Cycle
  • A balloon blown up and small coin
    Singing Balloon Experiment
  • mini DIY greenhouse made from a plastic bottle
    Easy DIY Mini Greenhouses
  • Does colour affect temperature?

Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Welcome!

Imagine a world where science education is accessible to everyone and is all about hands-on, exciting discoveries. That’s the world I want to create.

More about me

Around the World in 50 Experiments

50 experiments about countries of the world

Footer

↑ back to top

Science Sparks - FREE science experiments for kids

Newsletter

  • Sign Up! for emails and updates

Contact

  • Contact
  • Privacy Policy
  • Services
  • Media Kit
  • FAQ

As an Amazon Associate, I earn from qualifying purchases.

Copyright © 2025 Science Sparks - Wild Sparks Enterprises Ltd